The Robelle Magnesium Winter cover is a strong, UV-resistant polyethylene solid Winter cover for above ground pools. This cover includes a 4 ft. 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./yds. both the scrim count and material weight are good indicators of the strength of your pool cover. 2 grommets are placed on center every 4 ft. 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 12-year warranty. Color: Dark Gray.