Keep water and heat in and debris, leaves and trash out of your pool with the Bestway® Solar Pool Cover. Above ground swimming solar pool covers create a greenhouse effect in your pool. Solar covers also prevent water evaporation caused by dry winds, or free-chlorine loss caused by UV-rays. These covers are designed to keep water and heat in, but debris out. Extend your swimming session with a Bestway® Solar Pool Cover. Fits 18″ / 5.49m FastSet™, 16″ / 4.88m Power Steel™ and 15″ / 4.57m Steel Pro™ Pools.