The Gel-Kayano 21 Running Shoes are 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: 11 ounces-Size 9.