As a proud Wildcard apparel owner, you can wear your unique Wildcard knowing there is only one like it in the world. Through our unique processes and production methods, it is impossible to have two identical pieces. If your Wildcard apparel has a Serial No. on the inner tag, you can register for your Certificate of Authenticity. If you are experiencing any trouble with registering your Wildcard, please contact our Live Help or e-mail our Customer Service team.