Personalized Back to School T-Shirt. Whether you're a teacher getting ready to teach pre-k, kindergarten, or primary and secondary school students, or a student starting their first day of school, this back to school gift is the perfect way to kick off the school year. It's a happy and fun reminder of the summer vacation coming to an end and the start of a new chapter. Get ready to crush 1st grade or kindergarten with this awesome back to school design! 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.