Size: Suitable for a 183cm or 305cm diameter round swimming pool. High quality material: Swimming made of high quality environmentally friendly non-toxic PE (polyethylene) material. Waterproof swimming can extend the life of the swimming pool lengthen and make the swimming pool more durable. Function: The fits snugly over the top of the pool to prevent leaves, dust and debris from collecting in the pool. The wear-resistant rope is fixed to prevent it being blown away by the wind. Reduce water waste: Limit evaporation and reduce chemical needs. Easy to set up: Lightweight, foldable, soft to the touch and won't hurt your hands. Easy to move, where wherever you like,like gardens,camping,balconies.Easy to install,suitable for round swimming pool 1.This is a must-have for water sports enthusiasts.We will bring you a quality experience. 2.These s are made of durable non-toxic PE (polyethylene) material to avoid strong sunlight from the pool. 3.Prevent dust,leaves and debris from accumulating in the pool. 4.The wear-resistant rope is easy to fix and prevents it from being blown away by the wind. 5.Limit water evaporation and reduce the need for chemicals.