Personalized 1st Grade Back To School Long Sleeve T-Shirt. Team 1st grade Long Sleeve T-Shirt - Black cute first grade teacher or student back to school gear. 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