The Swimline 30-Foot Round Above Ground Winter Swimming Pool Cover is great for keeping your pool in good condition during the cold, winter months, but it will also make getting your pool back into shape in the spring much easier. This pool cover is made of laminated polyethylene sheeting woven with thick, high-density polyethylene stitching, which ensures superior tensile strength and durability. It has also been treated to provide maximum resistance to damaging ultraviolet rays. It features a ratchet and cable system with high tested vinyl coated cable and provides maximum resistance to damaging Uv rays. Not only does it keep your pool in stellar condition, but it prevents debris from getting in so when the season rolls back around, you can get back into the swim of things easier and with less maintenance. For the long life of your pool, choose the Swimline 30-Foot Round Above Ground Winter Swimming Pool Cover.