Overlap liners drape over the pool walls and are secured with coping strips. Bead receivers are not needed for this type of liner, which is compatible with flat-bottom pools with 54 walls. Superior Construction: Made from virgin vinyl, these liners are vacuum-sealed, heat-bonded, and vulcanized with lap-welded seams, ensuring durability and long-lasting performance. UV Resistant: Using Lamiclear technology, Smartline® liners resist fading from UV rays and chemicals and stay vibrant for longer.