Because the foam is 'closed cell' it will not absorb water, so unlike other blankets it's not necessary to coat the foam with a colored vinyl to keep the water out. The advantages of a simple floating blanket are rather astounding. Most importantly, a floating blanket almost completely eliminates evaporation. By eliminating evaporation a floating cover can reduce the operating costs of a spa in numerous ways.
Heat travels through moist air much quicker than dry air.
Most insulating covers eventually absorb water and get very heavy. Please see the Cover Store for on-line ordering.