Triathletes and fans came out to partake in one of the sillier Ironman World Championship race week traditions—the Kona Underpants Run!

Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy
Underpants Run, Kona 2013. Photo: Kurt Hoy