Personalized Country Code Mexico T-Shirt. Mexican pride T-Shirt - White with the three letter country code for Mexico, MEX, and the flag of Mexico. Perfect for Cinco De Mayo. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.