Biomechanically engineered for exercise but equally good for upping your everyday activity. This FFX evolution features a redesigned cleaner-look upper. In an engineered two-tone stretch knit that combines high-breathability areas with extra supportToe spring & heel kick smooth out movementInternal flex grooves help feet move naturallyMidsole widens at forefoot & flares out around trainer for stabilityTPU heel clip helps stop foot rollingSilver reflective TPU heel strip