Personalized Dancing Rock On Long Sleeve T-Shirt. Rock On in musical text with a happy dancing rock is a humorous music design. Fun gifts for back to school,marching band, birthdays, holidays and graduation. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL