Personalized 100 Days Of School 119-01 T-Shirt. Whether you're a parent, teacher, or principal, our 100 Days of School Apparel is a must-have. It's a great way to celebrate the milestone of 100 days of school and show your support for your child's educational journey. So why wait? Get your hands on this vibrant and exciting apparel and make your little star shine even brighter at school! 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.