Reebok Green Bay Packers Clay Matthews White Name & Number T-Shirt by Reebok. $20.88. Wearing this Green Bay Packers Clay Matthews Name & Number t-shirt from Reebok® lets everyone know you're a hardcore fan. The short-sleeve shirt is made of soft, breathable cotton for long-lasting comfort and durability. The classic white tee is designed with the full-color team logo screen-printed on the chest and the player's name and number screen-printed on the back. Adult men's sizes.