On Saturday, metro Detroiters stripped down to their underwear to for Cupid’s Undie Run, a “mile(ish) run” that raises funds and awareness of the genetic disorder neurofibromatosis. Participants gathered at the Tin Roof bar downtown for some liquid courage before braving the Michigan cold, which saw a high of 35 degrees. Proceeds from the event benefit NF research through the Children’s Tumor Foundation.