Blue Wave’s 8-year Solid In-Ground Winter Covers are crafted from durable polyethylene featuring a 7x7 scrim count. Designed to protect your pool from the winter elements, these covers will not allow water to pass through the material. A black underside and heat-sealed seams keep leaves, sticks, and other debris out of your pool. Features a generous 5-ft overlap for a proper fit. Integrated loops are spaced every four feet to secure water tubes (not included) and reinforced corner grommets allow for extra security. Backed by an 8-year warranty with 1 year fully covered.