Keep water and heat in, and debris, leaves, and trash out of your pool with this solar pool cover. Creates a greenhouse effect in your pool. Solar covers also prevent water evaporation caused by dry winds, or free-chlorine loss caused by ultra violet rays. These covers are designed to keep water and heat in, but debris out. Also helps to extend your swimming season. Made of durable polyethylene material. Compatible with 15 Ft./4.57m Fast Set Pools, 14 Ft./4.27m Power Steel Pools, 14 Ft. (4.27m) Steel Pro MAX Pools, 13 Ft. (3.96m) Steel Pro Pools, and 13 Ft. (3.96m) Power Steel Pools.