The Robelle Ultra Winter Cover is an ultra-premium, 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 top of this cover is dove gray, and the bottom side is black to prevent algae growth. Includes a premium quality binding around the entire perimeter of the cover that prevents against wear and tear, helps keep grommets in place, and adds to the life expectancy of this cover. The Robelle Ultra Winter Cover features an ultra-premium 12 x 14 scrim. This cover is constructed with an ultra-premium polyethylene material that weighs 4.5 oz./yard2. Both the scrim count and material weight are good indicators of the strength of your pool cover. A cover with the highest scrim count and heaviest material, like the Robelle Ultra Winter Cover, will last longer than inferior covers. Two premium 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 Ultra Winter Cover includes a twenty-year warranty.