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 students and teachers alike who want to commemorate this special occasion. Whether you're a parent looking for a fun outfit for your child or a teacher looking for a unique way to engage your students, our 100 Days Of School design is a great choice. 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.