The NikeCourt Air Zoom Vapor Cage 4 is innovated to withstand your toughest matches. It has 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.