K-Force is a blend of innovative technology with ever-reliable K-Swiss quality. The definitive leather upper of the Defier here comes with Outdoor herringbone outsole for clay, and Omni sole for true performance on other surfaces. Stripped-back pro design features, plus serious benefits from the 7.0 system like Shock Spring, make K-Force a no-compromise tennis shoe perfect for the rising star. • Durability is achieved with an Aosta® II rubber outsole combined with a high-abrasion toe and medial wrap. • Traction comes from a tennis specific, multi-surface herringbone tread pattern. • Cushioning is provided by a lightweight k-EVA midsole featuring Shock Spring® technology. Synthetic/ Mesh.