Personalized Preschool Rocks Youth Long Sleeve T-Shirt. Back to school Youth Long Sleeve T-Shirt - White says PRESCHOOL ROCKS in colorful primary colors. Keepsake and photo op gifts for preschoolers first day of school or Pre-K teachers. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)