To protect your in-ground swimming pool from the harsh winter elements you ll need a pool cover like the Swimline In-Ground 18 x 36-Foot Pool Cover. This 18 x 36-foot pool cover is perfect for keeping your in-ground pool in pristine condition during the winter months and it will also make getting your pool back into shape in the spring much easier. In-ground pool covers help prevent windblown dirt debris and leaves from entering your pool so you can get back to swimming with less hassle and in less time. This in-ground pool cover has been treated with a weather proof coating meaning it will protect from deterioration and have longer longevity. It s made of laminated polyethylene sheeting woven with thick high-density polyethylene stitching ensuring superior tensile strength and durability. Protect your pool during the harsh winter so you can enjoy it in spring with the Swimline In-Ground Pool Cover.