This winter above-ground 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! Winter above-ground pool covers are designed to help prevent wind-blown dirt, debris, and leaves from entering your pool, so you can get back to swimming with less hassle and in less time. This winter above-ground pool cover is made of laminated polyethylene sheeting woven with thick, high-density polyethylene stitching ensuring superior tensile strength and durability. This winter above-ground pool cover has been treated to provide maximum resistance to damaging ultraviolet rays to help it resist deterioration and increase longevity. U.V. Inhibitors protect the cover from sun damage. Overlap (cover size is 4 ft larger than pool size). Highly resistant to punctures, tears, chlorine stains, and other chemical stains. The Swimline air pillow is the ultimate companion to any winter pool cover. This Swimline air pillow will keep your pool and cover safe from ice in the winter months because it helps to keep water off of your pool cover, and it also helps to make sure your cover won't freeze to your pool water during the cold off-season. Measures: push your pool cover up off the water's surface so the water won't freeze to your pool cover. Keeps water off the top of your pool cover.