The Blue Wave Gold grade cover is constructed of our strongest and most tear material. This cover features rugged stabilized woven polyethylene that protects it from sun, snow, wind and ice. It features a black underside to 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. Our Gold 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 spaced 30 inches apart. This rugged cover is built to last, backed by a 15 year warranty (3 years full rated). Invest in quality this fall with Blue Wave Gold. This Blue Wave cover comes in Royal Blue with a black underside