Lomart liners are produced using a special blend of natural, raw materials that insure top-quality vinyl for all liners. 20 mil variable depth liners for depths up to 6 1/2 feet feature an additional surface area of rugged sidewall vinyl for maximum depth coverage and is designed to allow for an Optional Special-Purpose Deep Swimming Are for Underwater Swimming Only. No Diving. No Jumping. Capri Full Print Premium Variable Depth Liner offers three-color sidewall and pool bottom, with a dazzling collage of images for a pleasing contemporary design. 20 year warranty.