Personalized Beer Pong Referee Youth T-Shirt. Beer pong referee, keep your balls in line text with a game out of control is a funny back to school design for flip cup competitors. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.