Personalized 100 Days Of School 126-01 T-Shirt. Its versatility allows mothers to join in on the celebration with their daughters as they mark their 100 days of school. The matching outfit option for girls adds to the fun and festive atmosphere. 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.