Heat Your Pool +18°F Without a Heater.
Ditch shredding bubble blankets and leaky factory covers with drain holes.
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Every detail of the Cosari ThermoSkirt is built to solve the three biggest headaches of rectangular frame pool ownership: cold morning water, windblown leaf sludge, and evaporating chlorine.
Floating sheets leave an exposed perimeter gap where wind strips heat out of the water. By capping the horizontal top rails with an overhanging skirt, ThermoSkirt traps up to +15–20°F of solar warmth inside your pool overnight.
No rusty wire cables, winches, or DIY milk jugs. Reinforced white tie-down cord loops are stitched directly along the bottom skirt edge so you can cinch them cleanly around each vertical frame leg in seconds.
Factory covers punch holes in the middle that brew dirty rainwater and leaf tea straight into your pool. Our unperforated matte royal-blue tarp keeps 100% of storm runoff, oak leaves, and bugs out of your water.
Bubble blankets bake brittle under UV sun and shed thousands of blue plastic discs into your pump strainer. Our high-density cross-woven synthetic tarp has zero air bubbles to flake, peel, or delaminate.
Over 70% of pool heat loss happens through overnight surface evaporation. The matte royal-blue waterproof synthetic tarp absorbs solar warmth all afternoon and creates a dead-air thermal seal over the top rail—keeping water bath-warm until morning and cutting UV chlorine loss by over 50%.
Generous true-to-size rectangular corners drop 8.5 inches down the outside of your horizontal top rails without straining the seams. Built-in white bottom cord loops tie directly around your vertical steel support legs so 30 mph storm gusts can never get underneath.
Because there are zero center perforations, fallen leaves, pine needles, and acid rain stay harmlessly on top of the taut royal-blue tarp. Simply brush or hose debris off the edge before untying the pole loops to reveal crystal-clear water underneath.
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Pole-Anchored Waterproof Solar & Debris Cover for Rectangular Above-Ground Frame Pools
Backed by our 30-Day Money-Back Trial & Full Cosari Guarantee.
$79.99 $159.99 Free Tracked Shipping (5–7 Days) Included
In Stock: Delivers in 5–7 Business Days. Free insured US delivery with tracking.
30-Day Money-Back Guarantee plus a full 2-Year Warranty.
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Why Frame Pool Owners Are Ditching Bubble Blankets: Traditional blue bubble blankets were invented for sunken concrete pools where concrete coping blocks the wind. On an elevated rectangular steel-frame pool, wind slips right under a floating sheet, flips it into the yard, and dumps top debris into the water. Cosari ThermoSkirt solves this permanently by draping over the exterior top rail with an 8.5-inch tailored skirt and anchoring directly to the vertical frame poles via built-in white cord loops.
Sizing & Frame Compatibility Guide: Compatible with all standard rectangular steel-frame above-ground pools (including Intex Ultra XTR, Intex Prism Frame, Bestway Power Steel, Bestway Steel Pro MAX, and Coleman rectangular models). Order your pool's exact nominal frame size—our patterns already include extra corner tolerance and overhanging skirt depth so you never have to fight tight corners.
30-Day Backyard Trial & 2-Year Warranty: Every Cosari ThermoSkirt ships fast with Free Tracked Shipping and is protected by our 30-Day Money-Back Backyard Trial plus a 2-Year Multi-Season Replacement Warranty covering tarp seams, waterproof coating, and tie-down cord loops.
Free 5–7 Day US Shipping: Every order ships free with full tracking and delivers in 5 to 7 business days.
30-Day Trial: Try it at home for 30 days risk-free. Need help? Email us anytime at support@buycosari.com.
2-Year Warranty: If anything goes wrong within 2 years, we replace it free of charge or refund your order in full.
Woven matte royal-blue waterproof synthetic tarp contains zero fragile air bubbles—so you never vacuum disintegrated blue plastic circles out of your pool floor or pump basket again.
Direct UV sunlight burns off half of your unstabilized free chlorine in under two hours. Our opaque waterproof tarp shields your water from UV rays and locks chemical balance in place.
By trapping +15–20°F of natural solar gain and preventing 50°F spring/fall nights from chilling the water, your family swims comfortably from May through September without a $2,000 heater.
Cosari ThermoSkirtStandard Competitors
| Feature | Cosari ThermoSkirt | Standard Competitors |
|---|---|---|
| Overnight Heat Retention & Top-Rail Seal | Airtight 8.5" overhanging skirt locks in 95% of heat | Floats loosely with perimeter gaps or leaks air |
| Wind & Storm Anchoring | Pre-sewn white bottom cord loops tie to frame poles | Blows off in 12 mph gusts or slides up rails |
| Rainwater & Leaf Sludge Protection | 100% waterproof tarp with ZERO center drain holes | Center drain holes dump dirty leaf-tea into pool |
| Material Longevity & Filter Safety | Rip-resistant woven synthetic tarp (zero bubbles) | Brittle plastic bubbles flake into skimmer & pump |
| Out-of-the-Box Completeness | $79.99 complete with integrated pole tie-downs | $110–$150 blanket + $145 crank reel required |
Swipe left for steps 2 and 3
Unfold the matte royal-blue ThermoSkirt with a partner and pull it across your rectangular pool so the tailored 8.5-inch overhanging side skirts drop evenly over all four horizontal top rails.
Wrap the pre-attached white bottom cord loops around each vertical steel frame leg and tie a quick-release bow knot—creating a windproof, zero-gap thermal seal in under 3 minutes.
Brush off any top leaves, untie the pole loops, and fold the tarp back to dive into crystal-clear, bath-warm water—with zero skimming and zero heater bills.
Keeps our rectangular pool noticeably warmer and much cleaner. The fitted sides cover the rails nicely, and we are not constantly fishing out leaves.
I was very pleased to find a rectangular solar cover in the exact size I needed at a good price. It arrived quickly and was just as described. Great place to order from. A+++++++++.
I've only had it on the pool for about two weeks, but I love it so far. The water stays warmer overnight, and the cover feels like it should last several seasons if we take care of it.
I ordered larger because previous covers barely reached, but that wasn't necessary here. The side skirts already provide a generous overhang around the frame. Trust the measurements and order true to your pool size.
The white cord loops were easy to secure around our frame poles, and the fit on our 16x32 pool is nearly perfect. I cannot believe how warm the water gets. In May, we hardly need the heater.
After years of owning pools in Georgia and North Florida, we've learned sunshine can do plenty of the work. This cover holds that warmth in our above-ground pool and saves us from constantly running an expensive gas or electric heater.
It fits snugly over the top rails and ties down securely. Our water stays warmer overnight, and leaves no longer end up floating in the pool. I would absolutely recommend it to a friend.
Works great for warming the pool. The royal-blue waterproof tarp fabric feels sturdy, and the seams around the skirts look reinforced and durable. Very happy with the quality.
After a few sunny days, our water was nearly 20 degrees warmer than when we started. Covering the full rectangular frame also cuts down on evaporation, so we are not adding chlorine nearly as often.
My wife and I had it positioned and tied down pretty quickly. The white loops wrap easily around the frame poles, and the overhanging skirt stayed in place through a couple of breezy nights.
$79.99 $159.99 Free Tracked Shipping (5–7 Days) Included
In Stock – Free 5–7 Day US Shipping · 30-Day Risk-Free Trial.
Order your exact nominal rectangular pool frame size (for example, 9x18', 12x24', or 16x32'). Unlike cheap covers that run undersized at the corners, the Cosari ThermoSkirt is cut true-to-size with a generous 8.5-inch overhanging side skirt already built in on all four sides.
No—there are zero center drain holes. It is made of a 100% waterproof matte royal-blue synthetic tarp so dirty rainwater, steeped leaf sludge, and pollen never drain into your clean pool water.
Along the bottom hem of the overhanging royal-blue side skirt, pre-attached white tie-down cord loops are spaced around the perimeter. You simply loop and tie those white cords directly around your pool's vertical steel support poles.
No extra hardware or assembly is needed. The white perimeter tie-down cord loops come pre-sewn into the bottom edge of the skirt right out of the box—no rusty cable winches, clips, or mail-order grommet kits required.
Never. Unlike floating bubble-wrap blankets whose thin air pockets bake brittle under UV rays and chlorine, the ThermoSkirt is crafted from a solid, high-density cross-woven waterproof synthetic tarp with zero air bubbles to peel or delaminate.
Because the cover stretches taut over your top frame rails and anchors to the vertical poles, you can simply use a soft patio push broom or quick garden hose spray to sweep leaves and surface water off the side before untying the pole cords and folding it back.