Sneaker Soles Support Sporting Surfaces

Nike recycles old sneakers! They separate the shoe into three separate parts—the fabric upper, the foam in the midsole, and the rubber from the outsoles—and morph it into something called the "Nike Grind".

"Nike Grind Rubber, made from the shoe's outsole, is used in track surfaces, interlocking gym flooring tiles, playground surfacing and even new Nike products.... It's also used in trim items like buttons and zipper pulls.
Nike Grind Foam, made from the shoe's midsole, is used as a cushion for outdoor basketball and tennis courts, as well as futsal (indoor soccer) fields.
Nike Grind Fiber, made from the shoe's fabric upper, is used in the creation of cushioning pads for facilities like indoor synthetic courts and wood courts."