Personalized Caffeine Powers Activate Women's V-Neck T-Shirt. Caffeine Powers Activate! If your super powers take a cup or two (or five) of coffee to show up, then you have caffeine powers! Funny gift for any coffee lover. 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