Personalized 100 Days Of School T-Shirt. Celebrate the milestone of 100 days of school in style with our cute and happy 100 Days Of School design apparel! This design is perfect for both students and teachers who want to show off their pride for reaching this exciting achievement. Whether you're in preschool, elementary school, or even homeschooling, this adorable design will bring a smile to your face. 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.