Keep your pool water warmer the natural way with the Bestway 18' Solar Cover. Solar covers reduce evaporation and radiant heat loss by trapping the heat inside your pool and collecting the rays of the sun for additional heating. This cover also helps keep out unwanted debris. Easy to use, this cover fits just inside the edge of the pool and floats in place. Designed for use with the 16' Steel Pro round, above-ground frame pools or similar pools by Intex or Summer Escapes.