Personalized 100 Days Of School T-Shirt. Whether your child is attending school in person or virtually, our 100 Days Of School design apparel is a fun and stylish way to celebrate this special occasion. It also makes a great gift for teachers, classmates, or friends who are also marking this milestone. Get your hands on our cute and happy 100 Days Of School design apparel today and make the 100th day of school even more memorable! 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.