Donning a tan-colored loincloth, bone necklace, and nothing else, 50-year-old Glen Raines finished the 2017 Boston Marathon in 3:40:43.

On social media, Raines goes by the nickname “Barefoot Caveman.” He completed his first marathon in the prehistoric getup in 2010. Despite a tailwind throughout the course, it appears the precariously-skimpy outfit remained intact the entire way. He fist-bumped a fellow runner as he crossed the finish line.

It has yet to be confirmed if he is busy hunting for his postrace meal near the Charles River.

Editor's note: An earlier caption misidentified Raines as John instead of Glen.

Kit Fox Special Projects Editor Kit has been a health, fitness, and running journalist for the past five years.

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