Personalized 100 Days Sweeter | 100 Days Of School T-Shirt. Celebrate 100 days of school with our adorable and sweet 100 Days Sweeter design apparel! This cute and happy design is perfect for students and teachers alike. Whether you're a parent looking for a special outfit for your child or a teacher wanting to show off your school spirit, our 100 Days Sweeter design is sure to bring smiles all around. 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.