"Mawashi" is a particular kind of fundoshi loincloth typically used for sumo wrestling, a Japanese national sport, and for some hadaka-matsuri (a naked festival in which men go naked except for fundoshi loincloth) as well as for honozumo (a ritual sumo match held at a shrine).
廻しは、日本の国技・相撲や一部の裸祭り、奉納相撲に使われる特殊な褌。