Cupid's Undie Run: 21 Shots of Sprinters in Skivvies for Charity

On February 8, hundreds of people in Los Angeles will take to the streets in just their undies during Cupid's Undie Run, the nation's largest pantsless party and mile(ish) run for charity.

The event raises awareness of neurofibromatosis (NF), a genetic disorder that causes tumors to grow on nerves throughout the body, and raises funds for NF research through the Children's Tumor Foundation.

In addition to Los Angeles, Cupid's Undie Run will take place in 37 other cities across the United States. More information regarding the event can be found at My.Cupids.org. Take a look at past events in the following slideshow of photos, courtesy of Cupid's Undie Run.