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The Economy winter pool cover is fabricated of a strong blue polyethylene material constructed of seven vertical and seven horizontal threads per inch. This cover has an additional three foot overlap. The blue topside has been treated to inhibit damaging ultra violet rays, and the black bottom side prevents the growth of algae. A plastic coated cable is threaded through aluminum grommets and a ratchet lock allows you to tighten the cover around your pool. Two aluminum grommets four inches on center are placed every four feet around the perimeter. Two lines of double chain stitching are sewn on the edge to prevent wear and tear. The Economy winter pool cover comes with a five-year warranty. Shop and compare. You will not find a better winter cover at this price anywhere.