Personalized Best Grandpop Ever Youth T-Shirt. Distressed lettering Youth T-Shirt - White for the worlds best Grandpop makes a great birthday or Fathers Day present. 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.