The Pool Mate 12-Year In-Ground pool cover protects your pool during harsh winter conditions. This extra heavy-duty polyethylene cover blocks out any dirt & debris throughout the winter. The 12-Year Cover prevents algae growth by blocking UV rays from entering your pool in the winter. Pool owners who use a Pool Mate 12-Year 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 5-foot overlap. Overlap is additional material beyond the size of your pool. Please order by pool size and add to the length and/or width if you have steps or a buddy-seat. The cover should be able to float comfortably on the water. Ordering a larger size cover and putting the extra material inside the pool can help increase the pool cover's longevity. Includes water tube loops to be used with water tubes, sold separately. This high-quality lightweight cover features heat-sealed seams and is built to last longer. The Pool Mate 12-Year In-Ground pool cover comes with a 12 year warranty.