The 21' Round Overlap Pool Liner Dolfina delivers a dependable, stylish solution for above-ground pools. Designed with durability in mind, this liner features 20-gauge virgin vinyl construction and reinforced seams for long-lasting performance. Its attractive blue Dolfina pattern adds a clean, inviting look to round above ground pools, while the overlap-style design makes it easy to install. Included UV and chemical resistance ensures the liner holds up through seasons of exposure to chemicals and weather.