Personalized Country Code Japan Long Sleeve T-Shirt. Japanese pride Long Sleeve T-Shirt - White with the three letter country code for Japan, JPN, in the colors of the Japanese flag. 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