Personalized Worlds Best Mimi butterfly Women's V-Neck T-Shirt. Mimi Women's V-Neck T-Shirt - Heather has beautiful blue butterfly for the World's Best Mimi. 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