Runners wear underwear to raise awareness for colon cancer at the Undy Run in Arlington, TX on November 14, 2015. (Alexandra Olivia/ Special Contributor)

Runners wear underwear to raise awareness for colon cancer at the Undy Run in Arlington, TX on November 14, 2015. (Alexandra Olivia/ Special Contributor)

Runners shed their shorts and braved chilly November air Saturday during the Undy Run at Levitt Pavilion in Arlington. The event was designed to bring awareness to colorectal cancer, and entrance fees support, in part, the Mary Crowley Cancer Research Centers and research initiatives for the Colon Cancer Alliance. A pair of boxer shorts was included and the after race party included an inflatable, walk-through colon to help educate about the disease.

Check out our photos from the outer clothing-optional event (all are family-friendly and SFW): 

See the winners here.

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