A kidney-shaped pool creates a sizing problem that a standard rectangular pool does not. The cover has to deal with a long curved outline, a narrow waist and different widths at different points. The first buying decision is therefore not simply “what size cover?” It is what job the cover needs to perform. A floating solar blanket and an anchored safety cover solve very different problems, even though both may be sold under the broad phrase “pool cover.”
For everyday heat retention and evaporation control, an oversized rectangular solar blanket can be a practical way to cover a kidney-shaped pool. The blanket floats directly on the water and can be cut along the curves after you confirm that the untrimmed sheet reaches every part of the water surface. For winter closure or access protection, however, a floating bubble cover is not a substitute for a correctly specified safety-cover system. A custom safety cover is measured to the pool and deck, tensioned by springs and anchors, and treated as a separate category of product.
The three products here illustrate those two approaches clearly. The Freetime Fun listing is a custom safety-cover measuring and ordering kit for irregular inground pools, including kidney shapes. The VEVOR and BigXwell options are 16-mil, 16 × 32 ft solar blankets intended to float on the water; both can be trimmed to an irregular outline if that 16 × 32 ft starting rectangle fully contains the pool. That difference should drive the purchase before thickness, color or brand does.
Measure the water surface, not the outside edge of the coping. Record the maximum end-to-end length and the maximum side-to-side width. A 16 × 32 ft blanket can only be trimmed successfully if the entire kidney outline fits inside that rectangle. If any point of the pool is wider than 16 ft or longer than 32 ft, cutting cannot solve the shortage; a larger blanket or a custom solution is required.
Quick Comparison
- Custom measuring/order kit for kidney, freeform, oval, Grecian and other inground shapes
- Model PC9000; custom cover can be ordered in mesh or solid fabric
- Intended for an anchored safety-cover system rather than floating on the water
- 32 × 16 ft rectangular, 16-mil PE solar blanket
- Blue-and-black dual heat-locking bubble construction
- Cuttable for irregular outlines; listed net weight 37.70 lb
- 16 × 32 ft rectangular, 16-mil blue PE solar blanket
- Thermal-bubble construction for heat retention and evaporation reduction
- Can be trimmed with scissors to fit a kidney or other irregular pool
What to Look for When Buying a Pool Cover for a Kidney Shaped Pool
Start with the job: solar blanket or safety cover
The most important distinction is functional. A solar blanket is a floating sheet with air bubbles. Its main jobs are to slow evaporation, reduce heat loss from the water and keep some airborne debris from landing directly in the pool. It is removed before swimming. It is not designed to carry people, prevent access to the water or replace a barrier around the pool.
A safety cover is a structural system that spans the pool and is secured to the surrounding deck with straps, springs and anchors. Safety covers are subject to performance requirements that floating covers are not. For a kidney-shaped pool, a true safety cover normally has to be made from an accurate set of dimensions because the strap layout, overlap, obstructions and anchor positions all depend on the actual pool geometry.
This makes the Freetime Fun product fundamentally different from the two bubble covers. It starts a custom measurement-and-order process. The VEVOR and BigXwell products start as rectangles and are cut down for heat-retention use. They should not be compared as though all three are alternatives for the same purpose.
Maximum length and maximum width
A kidney shape is defined by curves, but solar-cover sizing starts with a rectangle. Find the longest distance across the water and the widest distance across the water, even if those two measurements occur at different locations. The starting blanket must be at least as long as the first number and at least as wide as the second.
For the two 16 × 32 ft solar covers in this guide, the limiting envelope is 32 ft by 16 ft. A pool that is 31 ft long and 15 ft 6 in wide can be a plausible candidate. A pool that is 30 ft long but 16 ft 8 in wide is not, because the narrow dimension of the blanket cannot cover the widest part. Leave yourself cutting margin rather than choosing a blanket that only matches the measurements on paper.
Thickness and handling
Both solar blankets reviewed here are listed at 16 mil. A thicker blanket generally has more material than a lighter-gauge version and can feel more substantial in the hand. The tradeoff is handling. Thick material becomes bulky once the cover is wet, and an irregular cut shape can be more awkward to fold or roll than a clean rectangle.
The VEVOR model provides a useful reference because its listed net weight is 37.70 lb before you begin handling it on the pool. Trimming away unused corners will reduce the finished mass, but the sheet remains a large piece of 16-mil PE. If one person will remove the cover daily, think about storage and retrieval before deciding that thicker is automatically better.
Cuttable material and trimming margin
A rectangular solar blanket only works on a kidney pool if the material can be cut without requiring a finished factory edge around the new outline. Both VEVOR and BigXwell describe their PE covers as trimmable. This is useful because a kidney pool rarely matches a stock oval or rectangle closely enough to leave the blanket untouched.
Do not trace the shape and make one aggressive cut immediately. Float the blanket, let the material settle and check how it lies around the curves. Make a rough cut first, leaving extra material, then refine the outline. Steps, ladders, handrails, raised walls and attached spas can complicate the cut, so those features should be mapped before the final trim.
Storage and reel compatibility
A solar cover performs only while it is being used, so a difficult removal routine often becomes a practical problem. Kidney-shaped covers are harder to roll neatly because the leading edge may be curved and the two lobes do not feed onto a reel as evenly as a rectangle. A reel can still be useful, but placement matters.
If you plan to use a reel, think about its axis before cutting. Some owners keep one edge straighter so the blanket feeds more predictably. Others split a very irregular cover into sections that can be handled separately. A 16-mil sheet is less forgiving of a poor storage plan than a light cover because there is simply more material to lift and roll.
Pool chemistry and cover life
Solar blankets spend their working life in contact with treated water and ultraviolet light. VEVOR specifically cautions against highly acidic or heavily chlorinated conditions for longevity. That warning reflects a broader maintenance point: cover life depends not only on material thickness, but also on chemistry, sun exposure, storage temperature and whether the cover is left folded in direct sun when it is off the water.
After shocking a pool or making a major chemical adjustment, follow the cover manufacturer’s instructions before putting the blanket back on. A thicker cover is not immune to chemical or heat damage. Good storage and balanced water can matter as much as choosing a heavy material in the first place.
Freetime Fun Custom Pool Safety Covers for Inground Pool
- Custom measuring/order kit for kidney, freeform, oval, Grecian, Lazy L and other inground pool shapes
- Model PC9000; custom covers are offered in mesh or solid fabric
- Can be self-installed or installed by a pool service company
The Freetime Fun listing addresses the part of kidney-pool ownership that a rectangular bubble blanket cannot: obtaining a cover built around the actual pool geometry. The Amazon item is identified as a Swimming Pool Safety Cover Measuring Kit, model PC9000. In other words, the listing is the beginning of a custom-cover process rather than a stock-size cover that you simply unfold over the pool.
That distinction matters because a buyer searching for a “pool cover for kidney shaped pool” may expect a finished cover to arrive immediately. Here, the value is the measuring system and the route to ordering a custom safety cover. Freetime Fun states that it can accommodate kidney, oval, Grecian, Lazy L, freeform and other shapes, and its custom-cover program offers mesh and solid fabric options.
Design and build
A custom safety cover uses the pool perimeter as a design input rather than forcing the pool to fit a stock rectangle. For a kidney pool, that is a major advantage. The cover can follow both lobes and the narrow center while maintaining the overlap and strap layout required by the finished design.
Freetime Fun’s custom program is offered in Gorilla Mesh and Gorilla Solid versions. The manufacturer describes the covers as domestically made and uses a measuring form to capture the dimensions needed for production. This is a different construction concept from a floating blanket: the finished cover spans the pool and relies on tension, springs and deck anchors instead of resting on the water surface.
The exact finished dimensions are therefore not fixed in the Amazon listing. They depend on the measurements submitted for the individual pool. That is appropriate for a true custom product, but it also means the buyer has more responsibility at the ordering stage than with a 16 × 32 ft blanket.
Important specifications and ordering process
The Amazon listing identifies the kit as model PC9000 and specifically names kidney and freeform pools among the supported shapes. The manufacturer’s custom-cover instructions use different measuring forms depending on the pool layout. For the custom program, the measurement form is completed and submitted so a cover can be quoted and manufactured to the supplied geometry.
The manufacturer’s current custom-cover information states that the Gorilla custom fabrics are available in mesh and solid versions and are backed by a 16-year warranty. The important buying implication is that the “specification” is not a single stock size: fabric type, pool outline, obstructions and the measurement drawing collectively define the finished cover.
Freetime Fun also states that custom covers are non-returnable and warns that a replacement cover may not necessarily align with existing anchors. That makes measurement accuracy especially important. If this will replace an older safety cover, do not assume that a new custom cover will drop onto the old hardware pattern without verification.
Practical use on a kidney-shaped pool
For a kidney-shaped inground pool, the strongest reason to consider this route is geometry. A safety cover cannot simply be cut freehand after manufacture in the way a solar blanket can. Strap positions, overlap and tension need to be engineered into the cover. A custom measurement process allows the two rounded ends, the inward waist and any unusual deck features to be represented before the cover is made.
The finished system is also intended for a different season and purpose than a solar blanket. A safety cover is usually associated with pool closure and controlled access, while a solar blanket is commonly used during the swimming season to slow heat and water loss. Someone who wants both functions may reasonably end up owning both types rather than trying to make one product do two jobs.
Measuring and installation
The manufacturer’s ordering workflow puts measurement first. Freetime Fun instructs customers to download and complete the appropriate measuring form and submit it for a custom quote. For unusual shapes, measurement points allow the manufacturer to reconstruct the perimeter more accurately than a simple length-by-width pair would.
Installation can be performed by the pool owner or by a pool service company, according to the Amazon listing. DIY installation, however, is more involved than trimming a bubble blanket. Anchor locations have to match the finished cover, spring tension has to be set appropriately, and deck material affects drilling and anchor selection. If the deck contains pavers, wood, composite sections or areas of limited concrete, discuss those details before installation rather than improvising around them.
A professional installer becomes particularly attractive when the pool has raised walls, waterfalls, attached spas, ladders, handrails or other obstructions close to the edge. Those features can change how the cover is fabricated and anchored. Accurate information at the measuring stage is easier to correct than a finished custom cover that was ordered around incomplete dimensions.
Important strengths
The first strength is that kidney shape is treated as a design requirement rather than a nuisance to be trimmed around. That is the correct approach for an anchored safety cover. The second is material choice: mesh and solid versions let the buyer choose between different water-management and debris-blocking characteristics rather than accepting one stock fabric.
The process also gives buyers access to a human support path. The manufacturer’s custom-cover program provides measuring forms and assistance, which is valuable when a pool is irregular enough that a simple catalog size is not meaningful. For a replacement project, this support can also help identify whether the old anchor layout should be reused, modified or replaced.
Important limitations
This listing is not the simplest answer for a buyer who only wants to reduce evaporation during summer. The custom process requires measurement, quotation, fabrication and installation. It is also not a drop-in replacement for a floating cover because the finished system uses deck anchors and springs.
Custom dimensions also reduce the margin for ordering mistakes. The manufacturer states that custom covers are non-returnable, so a bad measurement can be more consequential than trimming a solar blanket slightly wrong. Replacement-cover buyers have another variable to manage because existing anchors may not match the new cover.
Who should consider it
Consider this route if the goal is a custom anchored cover for a kidney-shaped inground pool, especially when a stock safety cover cannot match the outline. It also makes sense for pools with freeform curves or unusual dimensions that would leave excessive gaps with a standard safety-cover pattern.
A solar-blanket buyer should consider another option. If the real goal is warmer water, less evaporation and a cover that comes on and off frequently during swim season, the VEVOR or BigXwell products are closer to that use case—provided a 16 × 32 ft rectangle is large enough to contain the pool.
Pros
- Custom measuring process specifically accommodates kidney and other freeform inground pools
- Finished custom cover can be ordered in mesh or solid fabric
- Anchored safety-cover format addresses a different need than a floating solar blanket
- Manufacturer supports DIY or pool-service installation
Cons
- Amazon listing is a measuring/order kit, not a ready-to-use stock cover
- Accurate measurements are critical because custom covers are non-returnable
- Installation requires deck anchors and more work than placing a solar blanket
VEVOR Solar Pool Cover 32 x 16 ft 16 Mil Blue & Black
- 32 × 16 ft rectangular PE blanket with 16-mil thickness
- Model 400-32*16-S with blue-and-black dual heat-locking bubble design
- Listed net weight of 37.70 lb; material can be trimmed for irregular pool shapes
The VEVOR cover is the most specification-rich solar blanket in this comparison. The exact model is 400-32*16-S, sized 32 × 16 ft and made from 16-mil PE. The current Amazon listing identifies the color as blue and black and describes a dual heat-locking air-layer design. For a kidney-shaped pool, its key advantage is simpler: VEVOR explicitly says the sheet can be trimmed for irregular shapes.
This product should be viewed as an oversized starting rectangle. You float the blanket on the water, position it so all curves are covered, then remove only the excess material. The 16 × 32 ft dimensions therefore represent the maximum envelope before trimming, not the shape of the finished cover.
Design and build
The blanket uses a bubble construction with dense air pockets intended to slow heat loss. VEVOR describes the design as a double air layer, with the colored surfaces and bubbles working together as a thermal barrier. The material is polyethylene rather than a woven safety-cover fabric, so it is flexible enough to cut and float but is not intended to span the pool under tension.
At 16 mil, this is a relatively substantial solar-cover material. The listed net weight is 37.70 lb, which gives a more realistic sense of daily handling than thickness alone. On a kidney pool, some of that weight disappears when the four rectangular corners and other excess areas are trimmed away, but the remaining sheet can still be large and awkward when wet.
Important specifications
The verified dimensions are 32 × 16 ft, or approximately 9.75 × 4.88 m. The verified thickness is 16 mil, the main material is PE, and the listed net weight is 37.70 lb (17.1 kg). These figures matter because the cover has to be large enough before cutting and manageable enough after cutting.
Do not interpret “32 × 16” as meaning it automatically fits every kidney pool commonly described as 16 × 32. Pool dimensions may refer to nominal construction sizes, while the actual waterline and curved perimeter can differ. Measure the water surface itself. If the widest part is slightly over 16 ft, the blanket can be too narrow even though the pool is marketed as a 16 × 32 model.
Practical use
For daily use, the blanket floats bubble-side on the water and reduces the amount of exposed surface. That is especially useful on a kidney-shaped pool because open water around the curved shoulders can undermine the value of a poorly fitted cover. A careful trim lets the blanket follow the perimeter more closely than an untouched rectangle.
VEVOR also claims up to 95% evaporation reduction under suitable use. Treat that as a manufacturer performance claim rather than a guaranteed result for every pool, because wind, humidity, temperature, how completely the water is covered and how often the blanket is removed all affect evaporation. The practical point remains sound: covering more of the water surface generally gives the blanket more opportunity to reduce evaporation and heat loss.
Trimming and setup
Before cutting, center the full blanket over the water so every curve of the kidney fits beneath it. Mark the narrow waist, the two rounded lobes and any step area separately. A first rough cut should leave several inches of extra material rather than chasing the waterline immediately. After the blanket has settled, make a second pass to refine the edge.
A thick blanket can shift while you are marking it, especially if wind is moving the exposed overhang. Work in calm conditions and use the pool edge as a reference. If one end of the kidney shape is broader than the other, confirm the orientation before making the first large cut; rotating a 16 × 32 ft rectangle by mistake can leave you short on one lobe.
The manufacturer cautions against highly acidic or heavily chlorinated environments for product longevity. The user guidance for this model also treats it as a non-safety cover: it should be removed before swimmers enter, and people should not get on top of or swim underneath it. Those instructions are particularly important because a floating bubble sheet can conceal a person beneath the surface.
Important strengths
VEVOR gives the buyer unusually clear information for a solar blanket: model number, thickness, full dimensions, material and net weight are all stated. That makes it easier to plan around storage, reel capacity and handling rather than buying by nominal size alone. The cuttable PE construction also directly addresses irregular pools.
The blue-and-black configuration and dual-layer bubble design differentiate it from a basic single-color blanket. More important for a kidney pool, the sheet is large enough to be reshaped without seams if your measured water surface fits inside the 16 × 32 ft envelope. A one-piece finished cover is simpler to place than overlapping several smaller pieces.
Important limitations
The same 16-mil construction that gives the cover substance also makes it heavier. A listed 37.70 lb dry weight can be significant for one-person removal, and the irregular finished outline may not roll as evenly as a rectangle. Buyers with limited deck space should plan where the wet cover will go before trimming it.
Size is the other hard limitation. Trimming can remove material but cannot add it. If the pool is more than 32 ft long or more than 16 ft wide at any point, select a larger blanket instead of hoping the curve will compensate.
Who should consider it
This model fits a buyer who wants a substantial, cut-to-shape solar blanket and whose kidney pool fits completely inside a 16 × 32 ft rectangle. It is especially relevant if you want a verified 16-mil construction and want to know the approximate weight before buying.
Choose another direction if you need a safety cover, if the pool exceeds the starting rectangle, or if a 37.70 lb sheet will be too cumbersome for your removal routine. A custom safety cover solves access and closure needs, while a larger or lighter solar blanket may solve size or handling problems.
Pros
- Verified 32 × 16 ft, 16-mil PE construction with model-specific specifications
- Can be trimmed to follow a kidney or other irregular pool outline
- Dual heat-locking bubble design is intended to slow heat loss
- Published net weight helps buyers plan handling and storage
Cons
- Listed 37.70 lb weight can make one-person handling cumbersome
- 16 ft width is a hard limit before trimming
- Floating solar blanket is not a safety cover and must be removed before swimming
BigXwell Heavy-Duty Solar Pool Cover 16x32ft – 16Mil Blue
- 16 × 32 ft rectangular 16-mil blue PE solar blanket
- Thermal-bubble construction for heat retention and evaporation control
- Cuttable with scissors to fit kidney, freeform and other irregular pool outlines
BigXwell takes the same basic route to a kidney-shaped pool as VEVOR: begin with a full 16 × 32 ft rectangle and trim away the material that sits outside the waterline. The exact Amazon listing specifies a 16-mil blue PE cover measuring 384 × 192 inches. Its product description specifically states that the sheet can be cut with scissors and fitted to pools of different shapes.
The appeal here is straightforward. If your kidney-shaped pool fits within the 16 × 32 ft envelope, you can create a one-piece solar cover without paying for a custom-cut floating blanket. The result is intended for heat retention and evaporation control, not for spanning the pool as a safety barrier.
Design and build
The cover is built from PE with a field of thermal bubbles. These bubbles create insulating air pockets between the water and the exposed surface. Like other solar blankets, the design depends on broad contact with the water surface rather than tension across the deck.
The 16-mil thickness gives it the same nominal material gauge as the VEVOR product, but the two products should not be treated as identical. BigXwell uses a blue configuration and markets its own thermal-bubble construction, while VEVOR lists a blue-and-black dual heat-locking arrangement and publishes a model-specific net weight.
Important specifications
The Amazon listing verifies a size of 32 ft by 16 ft, equivalent to 384 by 192 inches, with 16-mil thickness and polyethylene material. Those are the specifications that matter most for a kidney-shaped pool because they determine the starting rectangle and the type of trimming possible.
BigXwell also states that the blanket can be cut with scissors. That characteristic is central to this use case. The original rectangular dimensions do not need to match the final pool outline, but they must exceed it in both directions before any cuts are made.
Practical use
Once trimmed, the cover should float across as much of the water surface as practical. The kidney shape will produce two broad curved ends and a narrow middle section. If the cover is cut too tightly around the waist, normal movement on the water can make the edges pull away from the sides; if it is left too large, excess material can bunch against the coping. A gradual trimming process helps find the workable middle ground.
BigXwell claims that the cover can reduce evaporation by up to 95%. Real results depend on conditions and coverage, so the more useful buying lesson is to maximize the covered water area without making the blanket difficult to place. Gaps around steps, ladders and the narrow center of the kidney can become disproportionately noticeable on an irregular pool.
Trimming and handling
Use the same conservative trimming method you would use with the VEVOR sheet: place the full blanket on the water, confirm orientation, make an initial oversized cut, then refine it. Household scissors are sufficient according to the product information. Cutting in smaller passes is safer than trying to copy the pool outline in one pass.
If the pool has a built-in step or attached spa, decide whether the blanket will cover that area as part of the main sheet or stop at the transition. A complicated single piece can be harder to remove than two simpler sections. The best cut is not always the one that follows every inch of coping; usability matters because the cover needs to go back on regularly to provide its intended benefit.
Important strengths
BigXwell offers a simple match for a common irregular-pool strategy: buy a rectangular solar blanket large enough to cover the maximum dimensions, then trim it. The verified 16-mil PE construction is substantial, and the 16 × 32 ft size is widely useful for medium-to-large residential pools whose water surface stays within those limits.
The product is also less procedurally complex than a custom safety-cover order. There is no anchor pattern to design and no custom fabrication wait. For a homeowner whose only goals are heat retention, evaporation reduction and surface debris control during the swimming season, that simplicity can be an advantage.
Important limitations
The biggest limitation is the same physical one faced by any 16 × 32 ft sheet: it must be large enough before cutting. A kidney pool may have a nominal size that sounds compatible but still exceed 16 ft at its widest bulge. Measure first.
BigXwell also provides less model-specific handling information than VEVOR does in the listings reviewed here. The dimensions and material are clear, but a verified net weight for this exact Amazon variant is not stated in the same way. Buyers who are especially concerned about lifting weight may therefore find VEVOR’s published figure more useful for planning.
Who should consider it
Consider the BigXwell if you want a 16-mil blue solar blanket, your kidney-shaped pool fits inside a 16 × 32 ft rectangle, and you are comfortable trimming the final outline yourself. It is a practical fit for heat-management use rather than pool closure as a safety system.
Consider another option if the pool is larger, if you need a cover that anchors to the deck, or if the pool has so many obstructions that a single trimmed blanket will be frustrating to handle. In those cases, either a larger/multi-piece solar arrangement or a custom safety-cover process may be more appropriate.
Pros
- Verified 16 × 32 ft, 16-mil blue PE construction
- Can be cut with scissors to follow a kidney-shaped pool outline
- Thermal-bubble design supports heat retention and evaporation control
- Simple floating-cover setup without deck-anchor installation
Cons
- Cannot cover any pool point that exceeds the original 16 × 32 ft envelope
- Irregular one-piece shape may be awkward to roll or store
- Not an anchored safety cover and should not be treated as access protection
Detailed Buying Guide for Kidney-Shaped Pool Covers
Measure the waterline, then create a bounding rectangle
The cleanest way to size a solar cover for a kidney pool is to imagine a rectangle drawn around the entire water surface. Measure the longest point from one end of the kidney to the other. Then measure the widest side-to-side point, which may be located in one lobe rather than at the center. Those two maximum measurements define the minimum uncut blanket size.
This method avoids a common mistake: using the narrow waist as the width measurement. The waist is visually prominent, but it is not the limiting width. The broad lobe may extend several feet farther. If the blanket is sized to the waist, one or both rounded ends can remain partly uncovered.
Take measurements at the waterline rather than from the outside edge of the deck. Solar blankets float on the water and are trimmed to that working surface. Deck measurements can unnecessarily increase the size requirement and make the finished cover harder to handle. Safety-cover measurement is different because deck layout and anchor positions matter; follow the custom-cover form for that category instead.
Add working margin before you cut
A blanket that exactly matches the pool’s maximum dimensions on paper gives you almost no room for measurement error, material movement or an imperfectly square starting sheet. A small amount of extra material is useful during fitting because it can be removed later.
This is especially important around the curved ends. A kidney pool can be 16 ft wide at only one specific point, while the blanket’s edge needs to reach that point after the whole sheet is aligned. If the cover shifts a few inches as it settles, a no-margin purchase can leave a crescent of exposed water that cannot be corrected.
Understand what 16 mil changes
Mil is a thickness measurement: one mil is one-thousandth of an inch. It is not the same as millimeter. A 16-mil blanket is therefore 0.016 inch thick. That does not by itself tell you lifespan or heating performance, but it does tell you that these products contain more material than common thinner blankets.
More material can make a cover feel less flimsy and can support a more substantial bubble structure. The handling cost is bulk. Thick blankets take more space on a reel and more effort to move by hand. On a kidney shape, the irregular outline can compound that issue because the cover does not fold into a tidy rectangle once trimmed.
Before buying, decide who will remove the cover and how often. A cover that is technically better insulated but too heavy to use regularly can become the wrong practical choice. If one person will uncover the pool every morning, handling deserves the same attention as thickness.
Bubble orientation
A bubble solar blanket is normally used with its bubble side facing the water so the air pockets contact the pool surface and the flatter side faces upward. Follow the manufacturer’s instructions for the exact cover, particularly when the two sides are different colors. VEVOR’s blue-and-black construction is a good example of why assuming both sides are interchangeable is not ideal.
Correct orientation also helps the blanket lie more evenly while you mark the kidney outline. If the sheet is upside down during fitting and then flipped after cutting, the way it settles against the curves may change slightly. Fit it in the orientation in which it will actually be used.
Trim in stages instead of tracing once
The safest cutting method is progressive. First, spread the entire blanket over the water. Confirm that every point of the pool is covered. Make a rough cut that removes obvious excess while leaving several inches around the perimeter. Let the smaller sheet settle, then make a second, more precise pass.
At the narrow waist, leave extra material until both lobes are correctly positioned. That inward curve is where an aggressive cut can create a permanent gap. Around stairs and ladders, decide whether a notch, a separate small piece or a clean termination line will make the cover easier to use.
Do not worry about preserving the original rectangle for appearance. The goal is a working fit that covers water consistently and can still be removed. A perfect tracing that takes two people fifteen minutes to align every day may be less useful than a slightly simpler shape that one person can deploy quickly.
Plan for the reel before final trimming
A reel works best when material feeds toward the tube in a predictable line. Kidney shapes do not naturally provide that. If the reel is mounted at one end, the two sides of the cover can roll at different rates because the curves reach the tube at different times.
You can reduce this problem by orienting the cover so the longest axis feeds straight into the reel and by keeping the reel-end cut relatively clean. Some irregular pools are easier with two cover sections rather than one. Dividing the blanket adds a seam, but it can reduce the mass of each piece and make storage more predictable.
Check reel capacity as well. A 16-mil blanket occupies more space on the tube than a thin sheet of the same area. If you already own a reel, verify that it can accept the thickness and approximate finished size before choosing the blanket.
Mesh safety cover vs solid safety cover
If you are choosing the Freetime Fun custom route, fabric type becomes a more important decision than mil thickness. A mesh safety cover allows rain and melting snow to drain through while blocking larger debris. That can reduce standing water on top but allows some fine material and water to enter the pool.
A solid safety cover blocks more light, water and fine debris, which can help keep the pool cleaner underneath. The tradeoff is water management on top of the cover. Depending on the design, drainage panels or a cover pump may be part of the system. Ask how the specific solid configuration handles precipitation before ordering.
Neither choice should be made from appearance alone. Climate, tree debris, winter precipitation, pump maintenance and the condition you want to find at spring opening all matter. A custom-cover specialist can also advise how unusual deck features around a kidney pool affect the chosen fabric and anchor pattern.
Anchors, decking and obstructions
An anchored safety cover depends on the material around the pool. Concrete, pavers, wood and composite decking can require different anchor hardware or installation methods. The custom measurement should identify areas where standard anchor spacing is difficult, such as narrow coping strips, raised bond beams or nearby walls.
Obstructions are equally important. Waterfalls, slides, handrails, ladders, attached spas and raised walls can change the cover edge. Some features can be removed for winter; others require cutouts or special treatment in the cover design. Photographing and marking these features during the custom-measuring process is more reliable than trying to explain them after fabrication.
Safety-cover standards and realistic expectations
A product described as a safety cover belongs to a category with performance requirements intended to reduce access to the water when the cover is correctly installed and used. That does not mean a cover makes the pool risk-free, and it does not replace fencing, gates, supervision or other layers of protection.
A floating solar blanket is categorically different. Do not walk on it, do not let children or pets treat it as a solid surface, and remove it completely before swimming. The blanket can hide a person underneath, which is why treating it as a safety device is dangerous even if the material feels thick.
Chemistry, sunlight and storage
Pool-cover material is exposed to chlorine, pH variation, sunlight and high temperatures. Keep water chemistry within the ranges recommended by the pool and cover manufacturers. After a strong chemical treatment, wait the instructed period before replacing the blanket. Trapping concentrated chemical fumes under the sheet can shorten material life.
Off-water storage matters too. A wet solar blanket folded in direct sun can become very hot. Use a reel cover or shaded storage area when possible. Rinse accumulated debris before long-term storage, allow the cover to dry as directed, and avoid dragging a trimmed edge across rough concrete.
Winter use is not the same as daily solar use
A solar blanket can reduce evaporation and heat loss, but it is not automatically a winter-closing cover for climates with snow, ice and heavy debris. Winter closure may require a different cover system and water-management plan.
For a kidney-shaped inground pool, this often leads to a two-cover strategy: a trimmed solar blanket during the swim season and a custom safety cover for the closed season. Buying two products for separate functions may sound redundant, but it is more logical than expecting a floating PE sheet to perform like an anchored structural cover.
Direct Product Comparisons
Freetime Fun vs VEVOR
These two products should be chosen by purpose before any other specification. Freetime Fun is the route toward a custom anchored safety cover. VEVOR is a floating solar blanket. If the goal is winter closure and a cover designed around the exact kidney perimeter, the custom measurement process is the relevant feature. If the goal is heat retention and evaporation control during the swimming season, the VEVOR sheet is the relevant design.
Installation is also very different. Freetime Fun requires accurate custom measurements and then installation of the finished system with springs and deck anchors. VEVOR requires no deck drilling; the work is in positioning and trimming the PE sheet. The custom cover is shaped before manufacture, while the VEVOR cover is shaped by the owner after purchase.
Handling frequency differs as well. A solar blanket may come off and go back on many times in a week, making weight and reel use important. A safety cover is typically installed for a longer closure period, so daily handling is less central but anchor setup and tension are much more important.
Freetime Fun vs BigXwell
The same functional divide applies to BigXwell. BigXwell makes sense when a 16 × 32 ft floating blanket contains the pool and you are willing to trim the kidney outline yourself. Freetime Fun makes sense when the pool shape has to be captured accurately for a custom anchored system.
A useful way to decide is to ask what should happen if a child approaches the covered pool. A BigXwell solar blanket must not be treated as a protective surface or access barrier. A properly specified safety cover is designed for a safety-cover role, though it still works as one layer in a broader pool-safety plan.
VEVOR vs BigXwell
VEVOR and BigXwell are direct competitors because both are 16-mil PE blankets in a 16 × 32 ft starting size and both can be trimmed for an irregular pool. The practical choice therefore comes down to construction details, handling information and which surface design you prefer.
VEVOR lists model 400-32*16-S, a blue-and-black dual heat-locking design and a net weight of 37.70 lb. BigXwell’s exact Amazon variant is a blue 16-mil PE blanket with thermal bubbles and the same 16 × 32 ft nominal rectangle. BigXwell verifies the cut-to-fit approach clearly but does not provide the same model-specific net-weight figure in the information reviewed for this variant.
For a kidney pool, neither has an inherent size advantage: both begin at 16 × 32 ft. If your maximum water dimensions exceed either number, neither is the correct starting sheet. If both fit, VEVOR gives more published handling data, while BigXwell offers a straightforward blue blanket design with the same nominal thickness.
Common Buying Mistakes
Buying by the pool’s nominal size instead of the actual waterline
A pool may be marketed as “16 × 32” while its actual curved waterline does not fit cleanly inside a 16 × 32 rectangle. Coping, wall construction and the way the shape is described can create small but important differences. Measure the water before buying a blanket.
The error becomes permanent after trimming. A blanket that is one foot too narrow cannot be fixed by clever cutting. If the measurement is close to the limit, moving up a size gives you useful working margin.
Confusing a solar blanket with a safety cover
Thickness can make a solar blanket look substantial, but 16 mil does not convert it into a safety cover. Bubble blankets float on the water and must be removed before swimming. They should not be walked on or relied upon to restrict access.
If safety-cover performance is part of the buying requirement, use a product and installation system specifically designed for that role. The Freetime Fun custom process belongs in that category; the two PE bubble blankets do not.
Cutting before the blanket has settled
A full 16 × 32 ft sheet is large and can shift as it is unfolded. If you begin cutting while one side is bunched or one lobe is misaligned, the error may not become visible until the cover is already short.
Position first, verify coverage from several points around the pool and make a conservative rough cut. Final trimming should happen only after the smaller sheet lies naturally on the water.
Ignoring steps, rails and attached spas
A kidney pool often has features that break the outline. A stair section can add several feet to one end, while a handrail can make a perfectly traced cover difficult to remove. These details should be part of the plan, not problems discovered after the main cut.
For a solar blanket, use notches or separate sections when that improves handling. For a custom safety cover, identify every fixed obstruction on the measuring form because the fabric and strap layout may have to be designed around it.
Choosing the thickest blanket without planning storage
A thicker solar blanket can be attractive for durability and insulation, but it also becomes bulkier. VEVOR’s 37.70 lb listed weight shows why this matters. Once wet, awkwardly shaped and rolled, a large kidney cover can be more difficult to manage than its dry specification suggests.
Measure deck space for the reel or folded cover just as carefully as you measure the pool. A cover that blocks a walkway or requires two people every time it is removed may see less use, reducing the benefit you bought it for.
Assuming a replacement safety cover will use the old anchors
Existing anchors may look convenient, but a new custom cover can have a different strap geometry. Freetime Fun specifically cautions that replacement covers may not match existing anchor locations.
Treat old anchors as information to share with the manufacturer, not as dimensions the new cover must automatically inherit. Reusing them without confirmation can distort tension or prevent the new cover from sitting as designed.
Frequently Asked Questions
Can a rectangular pool cover fit a kidney-shaped pool?
Yes, if it is a cuttable solar blanket and the rectangle is large enough to contain the entire water surface. Measure the maximum length and maximum width, buy a blanket that exceeds both, float it on the water and trim the excess. This approach does not apply to an anchored safety cover, which should be designed or fabricated for the actual pool geometry.
Is a 16 × 32 ft solar cover suitable for every 16 × 32 ft kidney pool?
No. “16 × 32” can be a nominal pool size, while the actual water surface may be slightly wider or longer at some points. A 16 × 32 ft blanket only works if the measured waterline fits fully inside that rectangle before trimming.
Which side of a bubble pool cover faces the water?
Use the orientation specified by the manufacturer; bubble solar covers are generally placed with the bubbles toward the water. This allows the bubble layer to contact the pool surface while the flatter face remains upward. Follow the exact product instructions if the two sides use different materials or colors.
Can I cut a 16-mil solar blanket with normal scissors?
BigXwell specifically states that its PE blanket can be cut with scissors, and VEVOR describes its blanket as cuttable for irregular shapes. Use sharp scissors, make a conservative first cut and refine the edge in stages rather than trying to trace the entire kidney shape perfectly in one pass.
Should I leave the solar cover larger than the waterline?
Leave extra material during the fitting stage, but the finished fit should be practical rather than excessively oversized. Too much material can bunch against the pool edge and make removal harder. Trim gradually until the cover lies naturally across the water without leaving unnecessary gaps.
Can I use a solar cover as a winter safety cover?
No. A floating solar blanket is not a safety cover and should not be treated as one. It is intended for heat retention and evaporation control. If you need a cover designed to restrict access during pool closure, use a properly specified safety-cover system and follow its installation requirements.
What is the difference between mesh and solid custom safety covers?
Mesh allows precipitation to drain through while blocking larger debris. Solid fabric blocks more water, light and fine debris but needs an appropriate method for dealing with water that lands on top. Climate, maintenance preference and pool-opening cleanliness all influence which is more suitable.
Do I need a custom safety cover for a kidney-shaped pool?
Not always, but irregular geometry often makes custom fabrication the practical route when a true anchored safety cover is required. The Freetime Fun measuring kit exists specifically to capture shapes such as kidney, freeform, Grecian and Lazy L so the finished cover can be built around the pool rather than forced into a stock outline.
Can a reel handle a kidney-shaped solar cover?
It can, but irregular edges may roll less evenly than a rectangle. Align the reel with the pool’s long axis where possible and think about the reel before making the final cut. On difficult shapes, two smaller cover sections can be easier to roll and store than one large piece.
How do I know whether VEVOR or BigXwell is large enough?
Measure the longest and widest points of the water surface. Both products in this guide start at 16 × 32 ft. If either maximum measurement exceeds the corresponding blanket dimension, move to a larger size. If the pool fits, the excess rectangle can be trimmed to the kidney outline.
Final Buying Considerations
The right pool cover for a kidney shaped pool starts with purpose, not brand. If you want a floating cover for heat retention and evaporation control, a cuttable rectangular solar blanket is often the most practical route. If you want an anchored safety-cover system for an irregular inground pool, the outline needs to be measured and incorporated into a custom design.
The Freetime Fun Custom Pool Safety Cover kit is the distinct option in this group because it begins a custom measurement and ordering process for kidney and other freeform shapes. It is appropriate to consider when the finished cover must be fabricated around the actual pool geometry and secured with deck anchors. Buyers should be prepared for careful measurement, custom-order restrictions and a more involved installation.
VEVOR and BigXwell are closer alternatives. Both are 16-mil PE solar blankets with a 16 × 32 ft starting rectangle and both can be trimmed for an irregular outline. VEVOR differentiates itself with a blue-and-black dual heat-locking design, model-specific specifications and a published 37.70 lb net weight. BigXwell uses a blue thermal-bubble design and offers the same basic cut-to-fit strategy without turning the project into a custom fabrication order.
Before choosing either solar blanket, verify the two numbers that cannot be fixed later: maximum pool length and maximum pool width. Then plan how you will remove and store the finished irregular sheet. A cover that fits the water but is too awkward to use regularly is not a successful fit. For safety-cover needs, keep the standard higher: use a cover system intended for that role, measured accurately and installed according to its instructions.
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