This winter cover is built to last! The Blue Wave Gold grade cover is constructed of our strongest and most tear resistant material. This cover features U.V. stabilized woven polyethylene scrim that protects the cover 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 Blue Wave Gold cover comes with loops every four feet to secure water bags, and corner grommets to allow for extra tie down in windy areas. The cover has a 5 foot overlap, and comes in royal blue with a black underside. Backed by a 15 year warranty (3 years full rated). Invest in a quality cover this fall with Blue Wave Gold.