Personalized Sailing 100 Days 1st Grade Long Sleeve T-Shirt. Funny 100th Day of School Long Sleeve T-Shirt - White for 1st grade, primary school teachers with sailboat and stars. My Kids Sailed Through 100 Days of 1st Grade. Celebrate your students 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