Silverking Supreme Heavy Duty 12x12 scrim Heavy Duty Winter Pool CoverCover is 4' Larger than Pool sizeCOVER GREAT FOR POOLS WITH LARGER TOP RAILSCover your pool for the winter rather than having to do all that messy cleaning in the Spring? A winter pool cover will prevent leaves, dirt and debris from entering your pool this Winter. Avoid that inconvenient spring clean-up caused by rain, snow, ice and algae which can easily form in an uncovered pool. The scrim is the weave tightness in the underlying thread construction. The higher the scrim number, the better the quality of the winter pool cover. Winter pool Cover Size is sold by POOL SIZE the cover will typically have a 4' overlap on Above Ground round and Oval Covers and a 5' overlap on a Rectangle INGROUND Winter Pool Covers If your top ledge is over 6" wide or you have a deck you should up-grade to bigger or different cover POOL COVER FEATURES 15 Year Warranty - 2 Years Full Heat Sealed, Double Stitched Seams Covers measure 4 feet larger than the pool's size Includes vinyl coated cable & easy to use winch on Round and Oval Winter Pool Covers Aluminum Grommets No Rusting Woven Triple Laminated UV Inhibited 12x12 scrim Silver Top / Black Bottom