THE MOST DURABLE VAPOR TO DATE.   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.   Exceptionally Durable 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.   Responsive Cushioning Zoom Air unit beneath your forefoot creates a springy sensation with every step.   Supportive Fit Unique lacing wraps your foot for support while you move. The medial eyestays are covered for added durability while sliding.   More Benefits Stiff frame on the lateral side creates a stable feel during side-to-side movements. 1/2-length sleeve creates a snug, sock-like fit. Designed for use on hard court surfaces.   Product Details Removable insole