Personalized Blast Off For 3rd Grade Youth Long Sleeve T-Shirt. Get ready for grade school Youth Long Sleeve T-Shirt - White with a rocket ship, planet and stars says BLASTING OFF FOR 3RD GRADE. Back to school gifts for 3rd graders and 3rd grade teachers. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)