Personalized 4th Birthday Sailboat Long Sleeve T-Shirt. Sailboat with number 4 for your child's 4th Birthday comes on a party Long Sleeve T-Shirt - White gift. 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