Leaf Net Winter Pool Cover for 18' Round Pool (Cover is 21') 18' 4- YEAR Manufacturer's Warranty Leaf Net Tight mesh traps even the smallest leaves before they reach your winter cover. * Other brands of leaf nets have larger mesh that allows small leaves to pass through to your winter cover and decompose in the spring. Made from durable woven polyethylene and carries a 4 year warranty. Extra 3-foot overlap and include a cable and winch to hold it securely in place over your winter cover. Black mesh fabric.