Buffalo Blizzard Economy Winter Cover for 21-Foot-by-41-Foot Oval Above-Ground Swimming Pools | Blue/Black Reversible | 3-Foot Additional Material EFFECTIVE AND SENSIBLE- The Economy Winter cover is both an economical and effective choice for your winter closing needs. It is both lightweight and a cinch to install. The Economy comes in reversible blue or black convenient color options. Dollar for Dollar you won't buy a better cover! FULLY COVER YOUR POOL - The Buffalo Blizzard Pool Winter Cover comes with 3 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 pool top rails. Secure this cover to your swimming pool with grommets placed every 3. 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 8x8 scrim per square inch.Made from tough polyethylene fabric it's the toughest, most durable material available that keeps unwanted items from falling into your swimming pool while closing it up for the season. WINTER IS APPROACHING- 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.