Reach a new level of fast. Lightweight mono mesh upper with an internal seamless bootie for a minimal fit. Dynamic Flywire technology locks the midfoot down for added support. Lightweight Phylon midsole with a Zoom Air unit in the forefoot for a cushioned, yet minimal ride. Blown rubber crash rails in the outsole for added cushioning and traction. Environmentally preferred rubber in the heel for durability. Wt. 9.0 oz.