Personalized 100th Day 100 Days Smarter Arrow Youth T-Shirt. 100 days smarter Youth T-Shirt - Vintage Hot Pink outfit to celebrate the 100th day of school in style. Cute hearts and tribal arrow design. 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.