Personalized Music Booster Hands Youth T-Shirt. Music held up by the hands of the word booster is a humorous design for dedicated music supporters and a fun way to show your involvement. 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.