The Robelle value-line winter cover is a UV-resistant polyethylene solid winter cover for above ground pools. This cover includes a three-foot overlap. Please order by pool size, as the overlap goes beyond the pool size listed. If you have a very large top rail, please consider a larger pool size. The cover should be able to comfortably float on the pool water without excessive stress. The top of this cover is Azure blue, & the bottom side is black to prevent algae growth. The Robelle value-line winter cover features a 7 x 7 scrim. This cover is constructed with a polyethylene material that weighs 2.2 oz./yard2 two grommets are placed on center every four'. with these grommets, you should use the included winch & all-weather cable to secure your pool cover. The Robelle value-line winter cover includes a five-year warranty.