The Robelle next-generation ripshield optimum above ground swimming pool cover is an advanced, super-premium solid winter cover for above ground pools. Robelle next-generation shield covers feature interlocking dual-layers of high-density, super-premium polyethylene. While this cover is lighter & easier to handle than standard pool covers, it is twice as strong. New tear resistant shield 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 & tear, helps keep grommets in place & adds to the life expectancy of this cover. The green Topside of this cover is coated to prevent damage caused by the sun's ultra-violet rays & the bottom side is black to prevent algae growth. The Robelle next-generation ripshield optimum features premium, heaviest-duty dual-interlocking layers. Extra-premium 12 x 14 scrim. Heaviest-duty extra-premium polyethylene weighs 4.5 oz./yd2 two premium grommets are placed on center every four'. with these grommets, you should use the included winch & all-weather cable to secure your pool cover. The Robelle next-generation ripshield optimum above ground swimming pool cover includes a twenty-year warranty.