Personalized Happy 100 Days Of Kindergarten T-Shirt. Whether it's for a special photo shoot, a school event, or just everyday wear, our 100 Days of Kindergarten design apparel is a must-have for any proud parent. 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.