SmartLine 21' Round Overlap Expandable Pool Liner — Swirl Bottom, 72" Height, 20 Gauge

This SmartLine overlap expandable liner is designed for 21' round pools with a swirl bottom and a 72" wall height. Constructed from 20 gauge, 100% virgin vinyl, it includes built-in UV protection to minimize fading and is formulated to resist punctures and cracking. Manufactured in the USA by top pool industry professionals with over 50 years of experience, each liner is hand-folded to make installation smoother and reduce wrinkles or imperfections. The material tolerates harsh pool chemicals and prolonged sun exposure, performing in temperatures from -50°F to 130°F. A gasket set is included to help prevent leaks and fits all thru-wall skimmers and water return lines.