Solid and stable, the Cage Delirium is built to offer maximum durability and stability for serious tennis players. Flexx Cage technology on the upper wraps the forefoot to provide lateral protection during aggressive movements while a molded TPU heel counter locks in the back of the foot to prevent slipping. The heavy duty outsole and extra rubber on the toe and medial side are designed to hold up to the demands of players that are hard on their shoes and is backed by a 6-month outsole durability guarantee. With an aggressive, modern look and loads of protection, this shoe is built to withstand the rigors of the modern game.Material: Mesh, Memory Foam, Rubber, TPU.