Personalized Dump Truck 1st Birthday T-Shirt. T-Shirt - Light Blue with big number one and yellow and orange dump truck with dirt graphic. This Is How I Roll. 1st birthday gift for boys and girls who love construction and dump trucks. 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.