Personalized 100 Days Of School T-Shirt. Whether your child is celebrating their 100th day of school at home or in the classroom, our apparel is a fun and stylish choice. It's also a great gift idea for teachers or classmates to join in the celebration. So why wait? Get your hands on our cute and happy 100 Days Of School bus design apparel today and make this milestone 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.