Participants run or walk either 10 kilometres or a full marathon naked. Participants tend to wear only shoes, socks and headwear. Women wear a top if their breasts are shaking too much. It has been held annually since 2003. It usually draws about 100 to 150 participants, of which one-tenth to one-fifth are women. Even though the event isn't organised by naturists and not only for naturists, half of the participants are naturists.
- "Nakujuoksu houkutteli yli sata juoksijaa ja vielä enemmän katsojia: "Hieman jännitti, tuleeko noloja tilanteita"". Iltalehti (in Finnish). 15 June 2017. Retrieved 9 December 2019.