Personalized World's Best Grandpa Toddler T-Shirt. World's Best Grandpa! Great Father's Day gift for your Grandpa, the world's best Grandpa! A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.