Made from durable vinyl, this pool liner is designed to fit 21ft round pools with a wall height of 52in. It's built to last, offering excellent resistance to wear, punctures, & tears. The liner is UV-resistant, chlorine-proof, ensuring durability. Ideal for quick setup in your yard or garden. | Vevor | | 21-ft Round Above Ground Pool Liner, Unibead Pool Liners, Standard Gauge, 52inch Wall Height | Blue | Best Buy