Nike's Flash Collection offers water-repellent uppers and 360-degree reflectivity throughout for the perfect protection when running in wet, dark conditions. Lightweight engineered mesh upper and strategically placed bonded overlays for added support. Medial adaptive fit system wraps the arch. Co-molded, dual-density foam midsole with forefoot Nike Zoom unit. Decoupled crash pad for a smooth, supportive ride. Environmentally preferred rubber Waffle outsole with BRS 1000 in the heel for durability. Deep anatomical flex grooves for a smooth ride. Wt. 8.7 oz.