The Pool Mate Sandstone In-Ground Pool Cover protects your pool during harsh winter conditions. This professional-quality, polyethylene cover blocks out any dirt and debris throughout the winter. The Sandstone Cover prevents algae growth by blocking UV rays from entering your pool in the winter. Pool owners who use a Pool Mate Sandstone 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 ft. 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. Includes water tube loops to be used with water tubes, sold separately. This high-quality, lightweight cover with heat sealed seams is built to last longer. The Pool Mate Sandstone In-Ground Pool Cover comes with a 12-year warranty.