Personalized 4th Birthday Rocket T-Shirt. Blast off into a happy fourth birthday with a red rocket, shooting stars, and astronaut celebrating the four year old's 4th 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.