Personalized 40 Rocks 40th Birthday Women's V-Neck T-Shirt. Pink butterfly with 40 Rocks on a 40th Birthday Women's V-Neck T-Shirt - White gift. 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