Personalized Big Brother Astronaut Women's V-Neck T-Shirt. Big Brother Astronaut is so cool, he's riding a skateboard on the moon. You really have to look up to him! Cute gift for any big brother with big dreams. 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit