This is a little NSFW obviously.
The World Naked Sledding Championships are now in their fifth year.
Centre in this photo is Mia Magma, who is a former Naked Sledding Champion.
Tim Spicer / Via chillisauce.co.uk
They take place in Braunlage - a town with air so pure that visitors have to pay a tax.
Ailbhe Malone / Via BuzzFeed
However, this year, there wasn't enough snow in Braunlage to host the championships, so they were held in Cochstedt - about an hour's drive away.
As this gif indicates.
Ailbhe Malone / Via BuzzFeed