The Robelle Magnesium winter cover is a strong, UV-resistant polyethylene solid winter cover for above ground pools. This cover includes a four-foot overlap, making this cover easier to secure to your pool than other pool covers. 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 Robelle Magnesium winter cover features a strong 10 x 10 scrim. This cover is constructed with a strong polyethylene material that weighs 2.91 oz./yard2 both the scrim count  and material weight are good indicators of the strength of your pool cover. Two grommets are placed on center every four feet with these grommets, you should use the included winch and all-weather cable to secure your pool cover. The Robelle Magnesium winter cover includes a twelve-year warranty.