Personalized Future Mechanic Childs Gift T-Shirt. Future mechanic T-Shirt - White says when I grow up I wanna be a mechanic with tool set design. 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.