Personalized Bike Bum Women's V-Neck T-Shirt. Bike bum text with a heart dotting the letter i in the word bike is a fun gift design for bicyclists at birthdays and holidays. 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