The Nike Free 5.0 v4 running shoe features an all no-sew upper design that's engineered to conform to the foot even better. Super breathable, very lightweight mesh upper. Proven and tested Phylite™ midsole features an engineered pattern of longitudinal and latitudinal sipes that produces a naturally efficient footstrike. BRS 1000™ rubber inserts in the outsole enhance durability at high-wear zones. Wt. 8.6 oz.