A swim spa loses heat from the water surface every hour it sits uncovered, and reheating takes time and energy. A floating thermal blanket cuts that loss by sitting on the water under the hard cover. This list compares the best swim spa thermal blanket options by size, thickness, fit and warranty, so the cover matches the spa.
This roundup compares 5 thermal blankets on what each listing states: size, thickness, fit and warranty. Listings were collected 4 November 2026.
This article is informational and is not medical advice. See our Medical Disclaimer.
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Quick picks
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1
Angooni 7′x7′ Hot Tub Thermal Blanket Chill Score 9.7/10Check price on AmazonA 7 x 7 FT floating thermal blanket in 16 mil that locks in heat, cuts evaporation up to 95% and trims to fit square tubs.
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2
Blue Wave 12-Mil Solar Hot Tub Cover Chill Score 9.6/10Check price on AmazonA 7-ft x 8-ft rectangular solar blanket in 12 mil that retains heat, reduces evaporation by up to 95% and trims to fit.
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3
Hot Tub Bubble Blanket - 9 x 9 FT 16-Mil Spa Chill Score 9.6/10Check price on AmazonA 9 x 9 FT square floating blanket in 16 mil PE that retains heat, reduces evaporation by 95% and cuts to any shape.
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4
Sun2Solar Blue 7 ft x 14 ft Rectangle Solar Cover Chill Score 9.6/10Check price on AmazonA 7 ft x 14 ft rectangular solar cover in 12 mil that retains warmth, reduces evaporation up to 95% and trims around protrusions.
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5
Sun2Solar Blue 10 ft x 16 ft Rectangle Solar Cover Chill Score 9.5/10Check price on AmazonA 10 ft x 16 ft rectangular solar cover in 8 mil that retains warmth, reduces evaporation up to 95% and trims around protrusions.
A 7 x 7 FT floating thermal blanket in 16 mil that locks in heat, cuts evaporation up to 95% and trims to fit square tubs.
Pros & ConsViewHide
Pros
- 16 mil, thicker than the standard 8-12 mil covers the listing names.
- Floats on the water to lock in heat and cut evaporation up to 95%.
- Trims with scissors to fit square, in-ground spas and stock tank pools.
- 1 Year Manufacturer warranty, the longest term here.
Cons
- Square 7 x 7 FT shape suits square tubs more than long rectangular swim spas.
- Expected use of about 1-2 seasons, since the listing calls it a consumable cover.
- Needs a hard cover over it for best winter results, per the listing.
- Bubble side must stay down on the water, so placement matters each use.
A 7-ft x 8-ft rectangular solar blanket in 12 mil that retains heat, reduces evaporation by up to 95% and trims to fit.
Pros & ConsViewHide
Pros
- 12-mil thermal bubbles with passive solar heating, per the listing.
- Raises hot tub temperature by up to 15°F, even on cloudy days or cool nights, per the listing.
- Trims to fit rectangular spas measuring up to 7-ft x 8-ft.
- 90-day warranty stated, unlike the picks with no term stated.
Cons
- 90-day warranty is shorter than the 1 Year Manufacturer term here.
- Rectangular shape suits rectangular spas more than square tubs.
- 12 mil, thinner than the 16 mil blankets here.
- No care instructions stated in the listing.
A 9 x 9 FT square floating blanket in 16 mil PE that retains heat, reduces evaporation by 95% and cuts to any shape.
Pros & ConsViewHide
Pros
- 16 mil PE material, strong and lightweight per the listing.
- 9 x 9 FT square, the largest square here.
- Cuts to the desired size and shape for pools and hot tubs of all shapes.
- Reduces water evaporation by 95% and keeps water clear of debris and leaves.
Cons
- No warranty term stated in the listing.
- Spec table dimensions describe a packed size, not the flat blanket.
- No pairing guidance with a hard cover stated.
- Square shape suits square spas more than long rectangular swim spas.
A 7 ft x 14 ft rectangular solar cover in 12 mil that retains warmth, reduces evaporation up to 95% and trims around protrusions.
Pros & ConsViewHide
Pros
- 12 mil rectangle for rectangular inground and above ground pools.
- Raises water temperature by up to 15 Degrees using the sun, per the listing.
- Retains warmth after the sun sets for consistent overnight temperature, per the listing.
- Extra overlap and trim-as-needed fit around protrusions.
Cons
- No warranty term stated in the listing.
- Rectangular pool cover, not shaped for square tubs.
- 12 mil, thinner than the 16 mil blankets here.
- No weight stated in the listing.
A 10 ft x 16 ft rectangular solar cover in 8 mil that retains warmth, reduces evaporation up to 95% and trims around protrusions.
Pros & ConsViewHide
Pros
- 10 ft x 16 ft rectangle, the largest rectangle here.
- Raises water temperature by up to 15 Degrees using the sun, per the listing.
- Retains warmth after the sun sets for consistent overnight temperature, per the listing.
- Extra overlap and trim-as-needed fit around protrusions.
Cons
- No warranty term stated in the listing.
- 8 mil, the thinnest cover here.
- Rectangular pool cover, not shaped for square tubs.
- No weight stated in the listing.
The best swim spa thermal blanket picks
Size, thickness and warranty
| Blanket | Size | Thickness | Warranty |
|---|---|---|---|
| Angooni 7×7 Blanket | 7 x 7 FT | 16 mil | 1 Year Manufacturer |
| Blue Wave 7×8 Cover | 7-ft x 8-ft | 12 mil | 90-day warranty |
| Gekufa 9×9 Blanket | 9 x 9 FT | 16 mil | Not stated |
| Sun2Solar 7×14 Cover | 7 ft x 14 ft | 12 mil | Not stated |
| Sun2Solar 10×16 Cover | 10 ft x 16 ft | 8 mil | Not stated |
2 listings state a warranty term and 3 state none. 3 blankets are rectangular and 2 are square.
Who should not buy these
If the swim spa is a long rectangle, a square blanket leaves part of the water open, so measure first and favor a rectangular cover. If the spa already has a hard cover that seals well, a floating blanket adds less, since the listing positions it as a layer under the hard cover. And if the cover must last beyond the 1-2 seasons one listing expects, check the thickness and warranty first.
Score notes
The Chill Score weighs performance, build and value most, with safety where it applies, and warranty, as published on our How We Review page. Here, performance covers stated size, thickness and heat retention. No listing states a safety certification, so safety is zero for all.
| Product | Chill Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Angooni 7×7 Blanket | 9.7 | 32 | 21 | 21 | n/a | 3 |
| Blue Wave 7×8 Cover | 9.6 | 29 | 20 | 20 | n/a | 2 |
| Gekufa 9×9 Blanket | 9.6 | 30 | 21 | 20 | n/a | 0 |
| Sun2Solar 7×14 Cover | 9.6 | 29 | 20 | 20 | n/a | 0 |
| Sun2Solar 10×16 Cover | 9.5 | 28 | 19 | 20 | n/a | 0 |
Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score. Safety counts only for powered gear or where the listing states safety features; where it does not apply, the score is taken over the remaining 90 points.
Angooni leads on thickness and warranty, with a 16 mil blanket and a 1 Year Manufacturer warranty. Blue Wave pairs a 12 mil blanket with a 90-day warranty, while Gekufa offers the largest square at 9 x 9 FT with no warranty term stated.
Check Your Space First
- Measure the spa before ordering: sizes here run from 7 x 7 FT to 10 ft x 16 ft, and 2 blankets are square while 3 are rectangular.
- Check the fit under the hard cover, since the Angooni listing pairs its blanket with a hard cover for winter results.
- Plan for trimming: several listings say the blanket can be cut with scissors to fit the spa shape.
- Store the blanket where it stays clean between soaks, and rinse as needed per the Angooni care notes.
Common questions
Does a thermal blanket replace a hard cover?
No. The Angooni listing pairs its blanket with a hard cover for winter results, and the blanket floats on the water while the hard cover closes over the top. Use the blanket as a layer under the hard cover, not instead of it.
Can a thermal blanket be cut to fit?
Yes, on the listings that state it. Angooni says to mark the shape and cut with scissors, Gekufa says the blanket can be cut to the desired size and shape, and Blue Wave says its cover can be trimmed to fit rectangular spas measuring up to 7-ft x 8-ft. Measure the spa first, then trim slowly.
How much evaporation can a thermal blanket cut?
Listings here claim reductions up to 95%, with Angooni, Sun2Solar and Blue Wave each stating up to 95% and Gekufa stating 95%. Treat those figures as maker claims, since they depend on the spa, the cover fit and the weather.
How long does a thermal blanket last?
It depends on the listing. Angooni expects about 1-2 seasons of use as a consumable cover, while the other listings here state no lifespan. Rinse as needed and keep the bubble side on the water, per the Angooni care notes.
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