Short answer
Can a floating blanket replace a hot tub cover?
No, not as a lid. A floating blanket rests on the water and cuts evaporation and heat loss, while a hot tub cover closes over the tub rim. The Spa Depot listings describe the blanket as protecting the spa cover from water absorption, which points to using both together.
In the floating spa blanket vs hot tub cover question, the difference is where each one sits. A floating spa blanket floats on the water itself, while a hot tub cover is the lid that sits over the tub. A blanket can sit on the water under a cover, since the blanket cuts evaporation and heat loss from the surface while the cover closes the tub.
This guide explains how the two styles differ, how to size a floating blanket, and four floating covers from maker listings, with sizes, thickness and care notes. Listings were collected 28 October 2026.
This article is informational and is not medical advice. Follow the maker instructions for your hot tub and cover, and ask a clinician about hot tub use if you have a health condition. See our Medical Disclaimer.
Chillveda earns a commission when you buy through links on this page, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure.
Quick picks
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1
Thermo-Float 16-mil 8ft x 8ft Hot Tub Bubble Cover Chill Score 9.6/10Check price on AmazonA heavy-duty 16-mil floating blanket covering up to 8 feet by 8 feet, trimmable to fit a spa.
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2
Thermo-Float 16-mil 7ft x 7ft Hot Tub Bubble Cover Chill Score 9.6/10Check price on Amazon
A heavy-duty 16-mil floating blanket covering up to 7 feet by 7 feet, trimmable to fit a spa.
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3
Hot Tub Bubble Blanket - 8 x 8 FT 16-Mil Square Chill Score 9.6/10Check price on AmazonA heavy-duty 16-mil floating blanket in an 8-foot square, cuttable to the size and shape of a pool or hot tub.
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4
BigXwell Heavy-Duty Solar Pool Cover 6x6ft Chill Score 9.6/10Check price on AmazonA heavy-duty 16-mil solar cover in a 6-foot square for hot tubs and spas, trimmable for a custom fit.
A heavy-duty 16-mil floating blanket covering up to 8 feet by 8 feet, trimmable to fit a spa.
Pros & ConsViewHide
Pros
- 16 mil film, heavy-duty for longer service life
- Reduces evaporation heat loss up to 95%
- Trim-to-fit coverage up to 8 feet by 8 feet
- Protects the spa cover from water absorption
Cons
- No weight stated in the listing
- Square shape only
- Handle with care during installation, per the care note
- No warranty term is stated
A heavy-duty 16-mil floating blanket covering up to 7 feet by 7 feet, trimmable to fit a spa.
Pros & ConsViewHide
Pros
- 16 mil film, heavy-duty for longer service life
- Reduces evaporation heat loss up to 95%
- Trim-to-fit coverage up to 7 feet by 7 feet
- Weight stated at 4.4 pounds
Cons
- Smaller coverage than the 8-foot version here
- Hand Wash Only care
- Square shape only
- No warranty term is stated
A heavy-duty 16-mil floating blanket in an 8-foot square, cuttable to the size and shape of a pool or hot tub.
Pros & ConsViewHide
Pros
- Cuts to any size and shape, per the listing
- Reduces water evaporation by 95%
- PE material the maker describes as strong and lightweight
- Solar heating from sunlight, per the listing
Cons
- Care asks for debris removal and full drying before storage
- No warranty term is stated
- Square shape only, cut to fit other shapes
- Dimensions listed as 96.06 inches, not a round 96 inches
A heavy-duty 16-mil solar cover in a 6-foot square for hot tubs and spas, trimmable for a custom fit.
Pros & ConsViewHide
Pros
- Cuts evaporation 95%, per the listing
- Heat-retaining design for hot tubs and spas
- Easy to trim for a custom fit
- Blocks debris, per the listing
Cons
- Smallest coverage here, 6 feet by 6 feet
- No weight stated in the listing
- Manufacturer listed as WOWELL DIRECT, not BigXwell
- No warranty term is stated
More to compare
Hot Tub Bubble BlanketCheck price on Amazon
7′x7′ Hot Tub Thermal BlanketCheck price on Amazon
Hot Tub Thermal Blanket Bubble Cover 16 Mil Insulation BlanketCheck price on Amazon
BigXwell Spa and Hot Tub Solar Pool CoverCheck price on Amazon
SPA and Hot Tub Bubble Cover 7x7 Foot RectangleCheck price on Amazon
Spa and Hot Tub CoverCheck price on Amazon
Floating spa blanket vs hot tub cover explained
A floating blanket is a sheet of bubble film that rests on the water. The listings here describe 16-mil film that floats, trims to fit, and reduces evaporation heat loss. A hot tub cover, by contrast, is the lid that closes over the tub and keeps the tub shut when it is not in use. The blanket works at the water surface; the cover works at the rim.
The Spa Depot listings make the pairing explicit: the floating blanket protects the spa cover from water absorption, which points to using both together rather than replacing one with the other. A blanket alone does not close the tub the way a lid does, while a cover alone leaves the water surface exposed to evaporation whenever the lid is off. For a tub that sits unused between soaks, the pairing addresses both: evaporation at the surface and closure at the rim.
| Blanket | Size | Film | Care |
|---|---|---|---|
| Spa Depot 8ft Blanket | 8 feet by 8 feet | 16 mil | Handle with care during installation |
| Spa Depot 7ft Blanket | 7 feet by 7 feet | 16 mil | Hand Wash Only |
| Gekufa Blanket 8×8 | 8 feet by 8 feet | 16 mil | Mild soap and water, dry before storage |
| BigXwell Solar Cover 6 | 6 feet by 6 feet | 16 mil | Warm soapy water and air dry |
Four floating spa blankets compared
These are scored on the Chill Score, which weighs performance 30, build 20, value 20, safety certifications 15 and warranty 15. No cover here states a safety certification, so all four score 0 for safety, and none states a warranty term, so all four score 0 for warranty.
| Product | Chill Score | Perf. /35 | Build /25 | Value /25 | Safety /10 | Warranty /5 |
|---|---|---|---|---|---|---|
| Spa Depot 8ft Blanket | 9.6 | 30 | 21 | 21 | n/a | 0 |
| Spa Depot 7ft Blanket | 9.6 | 30 | 21 | 20 | n/a | 0 |
| Gekufa Blanket 8×8 | 9.6 | 29 | 20 | 21 | n/a | 0 |
| BigXwell Solar Cover 6 | 9.6 | 28 | 20 | 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.
Choosing the right size
Measure the water surface, not the outside of the tub, since the blanket floats on the water. All four listings here are square, and all four trim to fit: the Spa Depot blankets are trim-to-fit, the Gekufa blanket cuts to the size and shape of a pool or hot tub, and the BigXwell cover is described as easy to trim for a custom fit. A blanket that is larger than the water surface can be cut down, while one that is smaller leaves open water that keeps evaporating.
Thickness is the same across all four listings at 16 mil, so size and care separate them more than film thickness does. The Spa Depot 8-foot blanket covers the largest surface here, up to 8 feet by 8 feet, while the BigXwell covers 6 feet by 6 feet. For a round tub, a square blanket still works, since the trimmable listings cut to shape.
Common mistakes
- Buying by the title size without checking the listed dimensions, since the Gekufa listing states 96.06 inches rather than a round 96 inches.
- Expecting a floating blanket to act as a lid, when the listings describe a film that floats on the water.
- Skipping the care notes: the Spa Depot 7-foot blanket is Hand Wash Only, while the Gekufa blanket must dry completely before storage.
- Leaving a blanket untrimmed on a smaller tub, so it does not match the water surface.
Common questions
Can a floating blanket replace a hot tub cover?
No, not as a lid. A floating blanket rests on the water and cuts evaporation and heat loss, while a hot tub cover closes over the tub rim. The Spa Depot listings describe the blanket as protecting the spa cover from water absorption, which points to using both together.
Do you trim a floating spa blanket to fit?
Yes, on all four listings here. The Spa Depot blankets are trim-to-fit, the Gekufa blanket cuts to the size and shape of a pool or hot tub, and the BigXwell cover trims for a custom fit. Measure the water surface first, then cut to that shape.
Does a floating blanket keep debris out?
It keeps debris off the water surface while it floats there, and the BigXwell listing names debris blocking directly. The Gekufa listing also describes keeping the water clear and free of debris and leaves when not in use. A floating blanket does not close the tub the way a lid does.
Can you use a floating blanket with a spa cover?
Yes. The Spa Depot listings state that the blanket protects the spa cover from water absorption, which only makes sense with both in place. Float the blanket on the water, then close the cover over the tub as usual.
Sources: Amazon product listings for the covers named above, collected 28 October 2026. Related: hot tub cover for winter and hot tub cover for above-ground spa.
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