Personalized Rocket Ship 6th Birthday Youth T-Shirt. Cute rocket ship 6th birthday Youth T-Shirt - Purple with bright red rocket ship surrounded by blue sky, stars and planets. Big number 6 in the porthole. For future astronauts and space explorers. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.