Constructed from 100% Virgin Vinyl with double-welded seams, they resist punctures and cracks and are UV-fade resistant using Lamiclear technology. Standard bead liners are designed to slip into a standard liner bead track, that lines the top of your pool wall. 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.