- Experience the ultimate in comfort and style with the 100% ringspun cotton Savannah Harley-Davidson Men's Duke T-Shirt. Be reminded of the thrill and power of the open road with the bold "Speed and Power" design on the front, while the vintage motorcycle graphic on the back adds a touch of nostalgia. Available in a striking cardinal color, this shirt is the perfect addition to any Harley-Davidson fan's wardrobe.