Personalized Happy 100 Days Of School Toddler T-Shirt. Show off your school spirit with our Happy 100 Days Of School apparel. Whether you're wearing it in the classroom or out and about, this design is a fun and cheerful way to celebrate this educational milestone. Grab yours today and make every day at school a little bit brighter! A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.