20X40 FT Swimming Pool Cover W/Center Step Made of high quality PP material, this high-grade pool cover is soft and has strong coverage with good toughness and abrasion resistance. Adopted porous tight mesh design, the pool cover can prevent water evaporation, keep out thick snow, silt and debris, reduce damage to swimming pool equipment, and save water resources. Prevents children and pets from drowning and enhances safety. A great choice and better protection for your swimming pool! Durable PP Material Reasonable Size Tight Mesh Design For Easy Installation High-grade Quality