Personalized 1st Grade Rocks T-Shirt. Back to school T-Shirt - White says 1ST GRADE ROCKS in colorful primary colors. Keepsake and photo op gifts for 1st graders first day of grade school or 1st grade teachers. Everyone loves our Custom T-Shirts! Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.