The Robelle Next-Generation RIPSHIELD Pro-Select Above Ground Swimming Pool Cover is an advanced, super-premium solid winter cover for above ground pools. Robelle Next-Generation RIPSHIELD covers feature interlocking dual-layers of high-density, super-premium polyethylene. While this cover is lighter and easier to handle than standard pool covers, it is twice as strong. New tear resistant RIPSHIELD technology prevents punctures from expanding into significant tears. This cover includes a four-foot overlap, making this cover easier to secure to your pool than other pool covers. 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 blue topside of this cover is coated to prevent damage caused by the sun's ultra-violet rays and the bottom side is black to prevent algae growth. The Robelle Next-Generation RIPSHIELD Pro-Select features premium, heaviest-duty dual-interlocking layers. Extra-premium 14 x 12 scrim. Heaviest-duty extra-premium polyethylene weighs 4.5 oz./yd2. 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 Next-Generation RIPSHIELD Pro-Select Above Ground Swimming Pool Cover includes a twenty-year warranty.