Place this pool ground cloth under your swimming pool and it will provide the necessary protection and extend the life of your pool liner! Durable fabric: This pool ground cover is made of good-quality, durable polyester geotextile. This type of material is lightweight, resilient, and breathable. In addition, it also has a good water permeability which allows water to flow freely through the material, preventing pooling and runoff, and reducing erosion.Protect your liner: The pool floor protector helps prevent grass, roots, rocks, or other sharp objects from damaging your pool's liner. In addition, it also helps cushion the floor of your pool, creating a soft pool bottom for your feet.Extend the life of the pool: With the protection of the pool ground sheet, the life of your pool liner will be extended, so you don't have to replace it as often. Note:The pool ground mat is pre-cut into 4 pieces for easy installation. You can place them against each other or connect them with duct tape to form the total size.