ALL SWIRL 16 Ft X 32 Ft Oval Above Ground Overlap Pool Liner 48" to 52" Side Wall 20 Year Warranty 20 mil 20 Year Manufacturer Warranty Made from 20 mil durable virgin vinyl. Tough, long-lasting 1/2" lap seams. Perma-sealed with state of the art equipment. Contains highest grade UV inhibitors for maximum weather ability and resistance to sunlight, bacteria, fungus, chemicals, and cold crack.