San Francisco 49ers #21 Frank Gore White Jersey. Walking around wearing this Frank Gore White Jersey. Lets everyone know you're a hardcore 49ers fan and will be the envy of your family and friends. This San Francisco 49ers jerseys 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 player's name is screen-printed on a sewn down nameplate at the upper back, with his number screen-printed in the center.