Personalized World's Best Poppa Long Sleeve T-Shirt. World's Best Poppa! Great Father's Day gift for your Poppa, the world's best Poppa! 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