The GEL-Kayano� 21 is updated with nothing but the best in ASICS technical innovation, featuring the next generation of FluidRide� and a ComforDry� X-40 sockliner for the lightest and most luxuriously stable ride yet. Mild to moderate overpronators will enjoy a more comfortably secure upper, uniquely designed with a new heel construction that complements the premium FluidFit� upper and Heel Clutching System�. Weight: 10.9 oz. Heel Height: 22mm. Forefoot Height: 12mm.