Personalized 1st Birthday Trucks T-Shirt. Big yellow trucks bring a giant number one and a cupcake with a single candle as a special delivery to the one-year-old's first birthday party! 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.