Enviro-Mesh cover keeps all the debris out of your pool while allowing water to pass through. There are woven tabs every four feet to secure the cover to your pool with the included winch and cable. These are a great alternative to grommets because they will never pop off your cover. Covers a 15' x 30' Oval pool. Total size is 18' x 33' Oval with 3' Overlap. 8 Year Warranty.