2015 Kona Underpants Run

Hundreds of triathletes, supporters and industry members stripped down for Thursday's Kona Underpants Run.

Photo: John David Becker

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In what has become one of the most popular traditions of Ironman World Championship race week, hundreds of triathletes, supporters and industry members stripped down for Thursday’s Kona Underpants Run. Read about the history and cause of this event here.

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