Personalized 3rd Birthday Sailboat Long Sleeve T-Shirt. 3rd birthday sailboat Long Sleeve T-Shirt - Pink with number 3 on its sail makes a fun nautical themed party day gift for a little boy. 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