Personalized Dump Truck 1st Birthday T-Shirt. A cute bear wearing a hard hat is driving a dump truck with a giant number one on it to celebrate your little one's 1st birthday! 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.