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The Super winter pool coveris fabricated of a very strong blue polyethylene material constructed of eight vertical and eight horizontal threads per inch. This cover has an additional four foot overlap to ensure complete coverage of those pools with larger top rails. 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 hem to prevent wear and tear. The Super winter pool cover comes with an eight-year warranty. Shop and compare. You will not find a better winter cover at this price anywhere.