Personalized World's Best Grandpa Long Sleeve T-Shirt. World's Best Grandpa! Great Father's Day gift for your Grandpa, the world's best Grandpa! Pre-shrunk 100% cotton 6.1 ounce long sleeve t-shirt. Double-needle stitched neckline and sleeves. Quarter turned. Shoulder-to-shoulder taping. Adult: S, M, L, XL, 2XL, 3XL