Reduce Water Evaporation: The round solar bubble cover can effectively prevent up to 95% of the water from evaporating.Ensuring enough water to be recycled and avoiding the waste of resources caused by frequent water additions Energy Saving and Efficiency Improvement: The hot tub solar cover can greatly shorten the heating time, and the hot tub solar Blanket insulation retards the heat release, avoiding wasting your money on continuous heating More Uses: The thermal blanket for hot tub absorb solar energy to heat water and keep your pool warm at all times.spa bubble cover prevents debris and leaves from falling into the pool and keeps the water clear. It is a good helper to maintain the swimming pool Easy to Cut: If your tub is irregularly shaped, you can put the covers on the hot tub first, then make a mark and cut along the mark.Our spa and hot tub cover perfect for In-ground or above-ground hot tub or swimming pools,outdoor hot tub spa, bath tub, massage pool Perfect Experience: 10 MIL Thickness,anti-wear,light,soft and good toughness,perfect fit to the water surface,easy to fold and store,long service life,our hot tub covers film makes you feel more secure.