These durable above-ground covers can warm your pool this year by up to 15°F. These covers are made to give you maximum heating properties combined with long life. The 8-mil covers are loaded with thermal bubbles that retain heat at night and on cool cloudy days. Blue/Silver Spaceage color allows the maximum amount of solar rays to reach you pool for optimal heating. All covers are U.V.-protected so they last under the most intense sunlight. Built to last and backed by a 5-Year Warranty.