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Above-Ground Winter Cover with 15-Year Warranty.This Defender top-grade cover is constructed of our strongest and most tear resistant material. This cover features rugged U.V. stabilized woven polyethylene that protects it from sun, snow, wind and ice. It features a black underside to retard algae growth and heat sealed seams to ensure a crystal clear pool next spring. The cover features a big 4 foot overlap that means it will fit pools with wider top rails and will not stretch and rip like smaller 3 foot overlap covers. This Defender top-grade cover is held secure by a heavy duty vinyl coated cable and tightener that is anchored to the cover by rip proof metal grommets. This rugged cover is built to last so it is back by a 15 year warranty (3 years full rated). Invest in quality this fall with a Defender Winter Cover. This Defender cover comes in royal blue with a black underside.