Valetmont advices to understand the 3 layers system

First Layer

This layer is used to transfer sweating from the body to the outside as quickly as possible, to not create a feeling of wetness.

It is important because if the body is wet, the cold sets in permanently. The cotton t-shirt (or turtleneck) that traps moisture and causes cold snaps when the effort stops.

An effective first layer is worn next to the skin and can be chosen from technical underwear in synthetic fibers or merino wool.

Mid-Layer

The second layer provides warmth to the body while expelling away moisture.

This layer is more or less warm depending on the weight and is chosen according to the outside temperature. It should be light and compact to fits it easily into a bag when temperatures rise.

Fleeces are very effective as a second layer thanks to their insulating performance and their ability to dry quickly. Light down jackets in natural or synthetic down are also a good choice because they are very warm and compact.

Third Layer

The third and final layer should protect from rain, snow and wind.

This layer is waterproof and windproof but also breathable to complete the work of the two previous layers. It can also provide thermal insulation with doubled models.

Depending on the needs, the weather and the activity of the practitioners, this third layer can be more or less protective, light, functional, warm or resistant.