Thermo-Tex 20'x40' Rectangle Swimming Pool Solar Cover, 3-Year Thermo-Tex Solar Pool Covers will extend your Swimming Season and lower your operating costs. According to the US Department of Energy, solar pool covers reduce chemical consumption, reduce pool heating costs, and reduce water evaporation. "U.S. Department of Energy" Thermo-Tex Solar Pool Covers are made from high quality, UV stabilized polymers that resist degradation caused by the sun and pool chemicals. Lighter weight design makes it easier to put on and take off of your pool. 3 Year manufacturers limited warranty. Made in USA and Canada.