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 sock liner 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 Fluid Fit upper and Heel Clutching System. Weight: 10.9 oz. Heel Height: 22mm. Forefoot Height: 12mm.