Dallas Cowboys #11 Roy Williams Throwback Jersey. Support your favorite by team wearing this Dallas Cowboys Roy Williams Throwback Jersey by Reebok. This team jerseys will be the envy of your family and friends. The v-neck jersey is made of durable, quick-drying nylon diamond back mesh and designed with the team name and player's number screen-printed on the chest. The team-colored jersey features the player's name screen-printed on a sewn down nameplate at the upper back, with his number shown at the center of the back.