Ski touring is a demanding and polymorphous activity. Not only does it require an equipment adapted to its different phases, it also needs a complex clothing system. To be able to adapt to the altitude, the time of day, the direction and inclination of the slope, the intensity of the effort, the sun or wind exposures, skiers generally equip themselves with several layers of clothing: a first breathable layer that evacuates perspiration towards the outside, a second thermal layer to keep the body warm and a third insulating layer to protect from bad weather and wind.