Personalized Kids 100 Days of School Cat Tee 100 Purrfect Days of School T-Shirt. It is an ideal gift for parents looking to commemorate this special occasion. Make the 100th day of school memorable with this adorable and meaningful apparel choice. 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.