The Nike Air Zoom Katana Cage III is designed for the serious runner looking for a lightweight training and racing shoe with great cushioning and breathability. Light and breathable mesh upper with synthetic overlays for support. Lining materials are perforated to add breathability. Full-length Phylon™ midsole with low-profile heel caged Zoom Air™ unit and integrated TPU midfoot shank. BRS 1000™ podular heel zone offers great durability. Lateral forefoot features soft yet durable Duralon™, medial toe-off zone. Wt. 7.8 oz.