21-ft Round Above Ground Pool Liner, Unibead Pool Liners, Standard Gauge, 52inch Wall Height, Designed for Steel Sided Above-Ground Swimming PoolsProduct Features Fit for 21ft Pools Our pool liner is specially measured to fit 21 ft round pools with a flat bottom and wall height of up to 52 inches, ensuring an exact and secure fit for your pool. Above Ground Pool Liner This vinyl pool liner adds a soft cushioning layer to the bottom of your pool, providing a smooth, comfortable surface for walking. It helps protect your feet and elbows while reducing the risk of injury, making it a pleasant