Floating Thermal Foam Spa Blanket 7' x 7' – Heat Retention & Protection | The Cover BrothersDeluxe Foam Thermal Blanket Protect Your Spa & Improve Energy Efficiency Give your spa the protection it deserves with our Deluxe Foam Thermal Blanket. Designed to float beneath your cover, it helps retain heat, reduce energy costs, and protect your cover from chemical damage. This versatile blanket also keeps your water clean by blocking debris, making it ideal for everyday useespecially in colder months. Sized at 7' x 7', it can be easily trimmed to