It’s been cold in Pyeongchang, South Korea, the site of the 2018 Winter Olympics. Very cold. While the Olympic’s men’s downhill skiing competition was postponed due to treacherous winds, nothing stopped runners from taking part in a bit of winter madness. Hundreds of runners participated on Feb. 10 in the 26th annual race that organizers in South Korea refer to as the “naked marathon.”

Talk about cool running! The temperature in Pyeongchang was 22 degrees, although it felt like 5 degrees with the wind-chill factor. Although the race—which apparently was about 10K in length and not a marathon at all—was billed as “naked,” there was no total nudity among runners. Gloves and beanies were allowed and all runners wore pants or tights or shorts. However, competitors were not allowed to wear shirts. (A few runners wore transparent wind shells or garbage bags.) That meant that 60 U.S. Army soldiers who ran in Saturday’s race were disqualified from medal consideration because they were ordered to wear shirts by their commanders, CNN reported.

Several hundred runners participated shirtless in the “naked marathon” on Feb. 10 in Pyeongchang, South Korea.