Exceptionally Durable Excellent used condition 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. Supportive Feel Unique lacing wraps your foot for support while you move.The medial eyestays are covered for added durability while sliding. Responsive Cushioning A Zoom Air unit beneath your forefoot creates a springy sensation with every step. More Benefits Stiff frame on the lateral side creates a stable feel during side-to-side movements. 1/2-length sleeve gives you a sock-like fit. Designed for use on hard court surfaces.