Personalized Penguin Dude Long Sleeve T-Shirt. Penguins are adorable marine birds of the Antarctic. This penguin dude definitely is proudly strutting his stuff. A fun gift design for birthdays and holidays. 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