This premium above-ground pool liner is constructed of standard gauge vinyl and will maintain its beautiful appearance for years. Strong, double-welded seams will withstand winter’s worst. Its rugged construction allows the liner to be backed by a 15-Year Warranty. This liner will fit an 18x40 foot oval above-ground pool, with either a 48 inch or 52 inch sidewall. Comes in a vibrant swirl bottom design.