The Blue Wave Gold 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 above ground pools with wider top rails unlike smaller 3 foot overlap covers. This Blue Wave Gold grade cover is held secure by a heavy duty cable and winch tightener that is anchored to the cover by rip proof metal grommets. 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.