Personalized Country Code Mexico Toddler T-Shirt. Mexican pride Toddler T-Shirt - White and Black with the three letter country code for Mexico, MEX, and the flag of Mexico. Perfect for Cinco De Mayo. A toddler-soft cotton tee in look-at-me, big kid colors. 4.5 oz., 100% combed ringspun cotton. White is sewn with 100% cotton thread. Topstitched rib crew neck. Double-needle stitched sleeves and bottom hem. Shoulder-to-shoulder taping.