The runners are male, and traditionally run completely naked in public places, with their genitals fully visible, on a designated route. The event was first organized in 1977 at the University of the Philippines Diliman to promote Hubad na Bayani (Tagalog for Naked Hero), a film.
The event is a tradition that began in the Philippines in 1977 to promote a film called "Hubad na Bayani" (Tagalog for Naked Hero), which celebrates male nudity.