The above-ground pool liners by Swimline are made up of heavy-duty, 100% virgin vinyl material protected with Lamiclear which protects against chemicals and Uv fading. It also boasts the best cold crack resistance in the industry so that your pool liner can withstand the harmful winter weather. You can be sure that pool liners by Swimline are made with high-quality materials and will last long winters and hot summers.This Overlap liner is made with an elegant swirl bottom design that will add to your pool s aesthetics. It is also perma-sealed ensuring that you will not experience leakages making for easy maintenance.