Braving the chill, runners in their underwear take part in a 5-km competition to welcome the winter solstice festival, which fell on Dec 22, in Southwest China's Chongqing municipality on Dec 21, 2014. The winter solstice marks the shortest day of the year in northern hemisphere. About 300 participants, with some of whom drawing colorful pictures and characters on their bodies, participated in the event. [Photo/IC]

Two participants show their twin colored drawings with two Chinese characters Jiyou, or gay friend, on their bellies in Chongqing municipality on Dec 21, 2014. [Photo/IC]

Some female participants pose for a group photo at the event in Chongqing Municipality on Dec 21, 2014. [Photo/IC]

Participants in their underwear do warm-up exercises under the guidance of a coach before the race in Chongqing Municipality on Dec 21, 2014. [Photo/IC]

Participants take off at the starting line in Chongqing Municipality on Dec 21, 2014. [Photo/IC]