Personalized Bernese Mountain Dog Dad (Worlds Best) Long Sleeve T-Shirt. Worlds Best Bernese Mountain Dog Dad Long Sleeve T-Shirt - White is a great gift idea for him. Stylish sports look pet logo. 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