Personalized Rockin' For 20 Years Women's V-Neck T-Shirt. Two happy rocks under a banner that reads Rockin' for 20 years is a humorous anniversary gift design to tickle the funny bone of friends and family. 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