Personalized Astronaut Birthday Youth T-Shirt. An astronaut floating in space surrounded by planet balloons and a rocket spaceship holds a birthday cake. Cute birthday gift for your little astronaut! 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.