Fila - Flow 6 W (White/Rivera-Silver) - Women's: Designed for the runner with medium to low and somewhat flexible arches who requires moderate guidance but also believes less shoes aids in performance. Flow(tm) system which provides climate control and guides the foot and shoe to work as one during the toe-off phase of the gait cycle. Super Action&trade sole provides ultimate cushioning. SA(tm) midsole creates a dynamic propulsion effect, the ultimate shock absorption in the heel and responsive cushioning for quick energy return in the forefoot. Blown rubber provides better cushioning and greater flexibility designed for the forefoot striker. Ever-Grind(tm) metal flakes have been added to the extended-wear carbon rubber ensuring that the heel-strike area will last 80% longer than traditional outsoles.