Personalized Submarine 1st Birthday Long Sleeve T-Shirt. THINGS ARE LOOKING UP 1st birthday Long Sleeve T-Shirt - White with big number 1, colorful submarine, little deep sea explorer in the porthole and bright fish with bubbles. 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