ɪn mˈɑːdɚn kɚɹˈɑːɾi, æz ɡˈʌvɚnd baɪ ðə wˈɜːld kɚɹˈɑːɾi fˌɛdɚɹˈeɪʃən ænd ɪts sʌbsˈɪdjɚɹi fˌɛdɚɹˈeɪʃənz, ɹˈɛd ˈækɐ ænd blˈuː ˈaʊ bˈɛlts ɑːɹ wˈoːɹn baɪ kəmpˈɛɾɪɾɚz.
In modern Karate, as governed by the World Karate Federation and its subsidiary federations, red (aka) and blue (ao) belts are worn by competitors.