Ripstopper Green Winter Cover with 4-Foot Overlap for 21-Foot Round Above-Ground Swimming Pools DEBRIS FREE FOR ME: Keep unwanted items from falling into your swimming pool while closing it up for the season with the use of the Ripstopper Winter Cover. Save time and energy on maintenance whenever you are ready to open up again as your pool will be free from debris. FULLY COVER YOUR POOL: The Ripstopper Winter Cover comes with 4 ft. of overlap allowing for a secure installation. This additional material is used to compensate for lower water levels, use of an air pillow and the swimming pools top rails. Secure this cover to your swimming pool with brass grommets placed every 4. Includes a vinyl coated cable and winch. DRAIN THE RAIN: Winter covers are designed to protect your swimming pool against rain, snow and high winds. It is highly-recommended that all excess water be removed from atop the cover during the off-season. This will elongate the longevity of the material and can be accomplished with use of a cover pump or siphon. DESIGNED TO DEFEND: Close your swimming pool confidently with double stitched and triple thick hems using UV resistant nylon threads that are used to withstand the sun. This lightweight cover has 12x12 scrim per square inch. WINTER IS COMING: The installation of a winter cover will likely require some assistance from friends, family or a friendly neighbor. In advance of seeking help, the water level should be lowered beneath the skimmer, winter plug inserted and the water winterized with closing chemicals.