Personalized Sailing 100 Days of School Youth T-Shirt. Funny 100 Days of School Youth T-Shirt - Heather 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. Let the good times roll in a durable T-Shirt that takes kids from school to play in an amazing array of colors. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar.