Pool winter cover keeps your pool in a tip-top condition during the off-season. It offers safety and prevents your pool from debris. Get this winter cover and your pool will be all ready when you're ready to swim again. Details: Blue 24 ft. diameter Fits 21 ft. above-ground swimming pools U.V. inhibitors protect the cover from sun damage Highly-resistant to punctures, tears, chlorine stains and other chemical stains Extreme weather resistant Includes steel cable and winch Polyethylene