Personalized 100 Days Of School T-Shirt. Whether your child is a student or a teacher, our 100 Days of School Apparel is suitable for all. It can be proudly worn by students to showcase their dedication and progress in their academic journey. It can also be a great gift for teachers and principals to commemorate the achievement of their students. 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.