Features: When you use the hot tub, putting the spa and hot tub cover on it can effectively reduce the heating time. Also, this can save you money. Our spa and hot tub bubble insulating cover is thickened to 16 mils, which has better heat preservation and water locking effect and is more durable. When you cover your tub cover after using our hot tub insulation blanket, it can reduce the damage to the cover and prolong the life of the cover. Specification: - Thickness: 16 mils. -Color: blue. - Size: 94.5inch Warm Tips: When using, the side with bubbles needs to be close to the water surface.