Personalized Grandpa Claus Youth T-Shirt. Cute GRANDPA CLAUS Youth T-Shirt - Heather with Santa cap is perfect for all Santa's helpers that are granddads, grand pops, poppas and papas. 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.