Personalized Shut Up and Run Youth T-Shirt. Shut up and run! A runner races along so fast that flames trail behind him. Great gift for the jogger, runner, marathon racer, or triathlete! 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.