The NikeCourt Air Zoom Vapor Cage 4 is innovated to withstand your toughest matches, thanks to an updated design that puts flexible, durable materials exactly where they're needed the most. A unique lacing system keeps your laces hidden for extra durability while sliding. The data-informed design places flexible, durable materials exactly where they're needed the most. The outsole material wraps over the midsole on the medial side for durability. A Zoom Air unit beneath your forefoot creates a springy sensation with every step. It has unique lacing wraps your foot for support while you move. The medial eyestays are covered for added durability while sliding.