Personalized Sailing 100 Days 1st Grade Youth T-Shirt. Funny 100th Day of School Youth 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. 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.