Midwest Canvas -2YR FULL 30x50 RECT SOLAR COVER 12 MILMidwest Canvas 2 Year Full 30x50 Rect Solar Cover 12 Mil is designed to retain heat, minimize evaporation, and keep your pool cleaner while reducing energy costs. The clear 12 mil material enhances solar heat absorption by allowing sunlight to pass through and warm the water efficiently. Built with UV resistant polyethylene, this cover is designed for durability and long term performance, preventing premature wear from sun exposure and pool chemicals.