Nike Men's Air Zoom Vapor X Tennis Shoes Synthetic Rubber sole Weight: approx. 12.8 oz. Upper: Nike Dynamic Fit technology combines with lightweight textiles to create a zero distraction upper. Padded collar provides added comfort. Midsole: Nike Zoom unit in the heel with a Phylon midsole for lightweight, responsive cushioning. TPU midfoot shank for lateral support and stability. Outsole: Nike XDR rubber in a herringbone pattern for excellent hard court traction. Generative design places added traction on the perimeter of the outsole to support explosive directional changes on the court.