Personalized Sailing 100 Days of School Youth Long Sleeve T-Shirt. Funny 100 Days of School Youth Long Sleeve T-Shirt - White for pre-K, preschool, kindergarten and grade school teachers with sailboat and stars. My Kids Sailed Through 100 Days of School. Celebrate your students being 100 days smarter. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)