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 support Toe spring & heel kick smooth out movement Internal flex grooves help feet move naturally Midsole widens at forefoot & flares out around trainer for stability TPU heel clip helps stop foot rolling Silver reflective TPU heel strip