KeepKool® DuraCopper® Double Walled Stainless Steel Mugs have an insulating layer of air between the walls to keep your drinks cold longer than regular mugs. No sweating and no need for coasters, even with the coldest beverage. Handsome “beer barrel” shape. Large, comfortable handle. Oversized 16.9 Oz. capacity. Holds a full 16 Oz. beer with room left over for a nice, foamy head. Easy to clean. Dishwasher safe.