Personalized North Pole 1st Birthday Long Sleeve T-Shirt. Long Sleeve T-Shirt - White for a little elf's 1st birthday with a polka dotted number one and red and white striped North Pole sign. Perfect for Santa's helper on his or her Christmas birthday. 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