Personalized Shut Up and Run 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! Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.