Personalized 100 Days Sharper | 100 Days Of School T-Shirt. Whether it's for a special school event or just to commemorate this important milestone, our 100 Days Sharper 100 Days Of School design apparel is a must-have. It's a fun and stylish way to celebrate your child's journey through their first 100 days of school. Get yours today and make their 100th day 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.