The new Gorilla Floor Padding makes foam obsolete. Unlike foam, which can be easily cut by nut grass, roots or rocks under your liner, Gorilla Padding is impervious to almost any sharp object, so it will virtually eliminate vinyl liner bottom leaks. It is super tough, but also adds a layer of cushioning that will stop footprints from forming. Each Gorilla Pad is cut to size and seamed for your pool — no more cutting and taping as with foam. Gorilla Floor Pad is also known as Liner Guard.