To help you play with speed on the tennis court, the Nike Air Zoom Ultra is built with lightweight materials for a streamlined fit and feel. Zoom Air in the forefoot provides cushion and promotes responsiveness during quick transitions. Durable rubber guards protect the toe for players that tend to drag during play. Upper: Lightweight and breathable mesh upper material. Flywire cables integrate with the laces and wrap the midfoot for enhanced lockdown. U-throat structure offers a snug, secure fit. Midsole: Articulated Air Zoom in the forefoot offers cushion and responsiveness. Removable insole. Outsole: Strategically placed, durable rubber helps reduce toe drag and abrasion.