Personalized Grandpa Little Racer Car Racing Youth T-Shirt. Grandpa's little racer Youth T-Shirt - Vintage Green grandson car racing gift for boys with rally flags. 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.