Personalized Trombone Shamrocks Arc Women's V-Neck T-Shirt. Trombone Shamrocks Arc Women's V-Neck T-Shirt - Heather are a neat way to show your pride in your brass! 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