Personalized Rock On Youth Long Sleeve T-Shirt. Rock On. A rock sits atop the word on is a humorous twist to a common phrase. Make your favorite rockers and music lovers smile with a unique gift at birthdays, holidays, graduations and back to school. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)