2015 Kona Underpants Run
Hundreds of triathletes, supporters and industry members stripped down for Thursday's Kona Underpants Run.
For access to all of our training, gear, and race coverage, plus exclusive training plans, FinisherPix photos, event discounts, and GPS apps, sign up for Outside+.































































































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.