Shoe Goo® is a multi purpose product. Its primary function is to rebuild worn down heels of shoes. Athletic footwear often wears away in areas where there is heavy friction with the ground. This frequently occurs on skateboard and tennis shoes. Not only is it a filler, it also acts as a waterproof sealer and protector preventing premature damage. It can be placed on soles as a non-slip surface, and can keep shoelace ends from fraying.