Personalized Owl 100 Days Kindergarten Long Sleeve T-Shirt. Funny 100th Day of School Long Sleeve T-Shirt - Athletic Heather for teachers and students with 3 cute owls on a yellow ruler says 100th DAY OF KINDERGARTEN. Celebrate being 100 days smarter. Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL