The Robelle Ultra Winter Cover is an ultra-premium, UV-resistant polyethylene solid winter cover for in-ground pools. This cover includes five feet of overlap, which will give you ample material to cover your pool. Please order by pool size, as the overlap goes beyond the pool size listed. Please order a larger size cover if you have steps (or any other irregularity) protruding from your pool. 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. 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. Ultra-premium quality water bag loops are placed every four feet. Grommets at all four corners. The Robelle Ultra Winter Cover includes a twenty-year warranty.