The Pool Mate Commercial-Grade Rip-Shield Green Above-Ground Pool Cover protects your pool during harsh winter conditions. This commercial-quality polyethylene cover blocks out any dirt and debris throughout the winter. The Commercial-Grade Rip-Shield Green Cover prevents algae growth by blocking UV rays from entering your pool. Pool owners who use a Pool Mate Commercial-Grade Rip-Shield Green Pool Cover and close their pool with the proper winterizing chemicals will have a clean pool in the spring that will be easy to open. It is always recommended to open your pool by mid to late May. This cover features a 4-foot overlap making it easy to install. Grommets are placed every 4 feet and should be used with the included cable and winch. Pool owners with larger top rails should consider ordering a larger pool size cover. Ordering a larger size cover and putting the extra material inside the pool can help increase the pool cover's longevity. The cover should be able to float comfortably on the water. Rip-Shield technology prevents small rips from expanding into larger holes. This commercial-quality lightweight cover has heat sealed seams and is built to last longer. The Pool Mate Commercial-Grade Rip-Shield Green Above-Ground Pool Cover comes with a 20 year warranty.