Protects floor of pool liner from punctures Comes pre-cut to your pool size Helps eliminate vinyl liner bottom leaks Provides a layer of cushioning for pool floor Above-ground pool liner pads are essential accessories designed to enhance the longevity and enjoyment of your pool. GorillaPads serve as a protective barrier between the pool liner and the ground, preventing damage from sharp objects like rocks or other debris that could puncture or tear the liner. By eliminating the bumps and unevenness of the ground, GorillaPads reduce the risk of injuries and enhance the swimming experience. Installation is simple, simply roll-out the pad before installing the liner. Select the size that matches your pool dimensions. GorillaPads are backed. Please note that the vinyl liner is sold separately.