Cooling or warming effect through moisture regulation.
This builds the first and decisive layer of the system. It cools when you sweat and warms when you're cold. During higher levels of activity a thin, cooling film of moisture is maintained while excess sweat will be transported away. During light activity, the Decision Layer insulates.
The second layer of the system disperses the moist warmth in the inner milieu, without allowing the moisture to condense, and therefore stabilises the cooling effect of the first layer. At the same time it builds channels and spaces in which warm air can be collected and stored.
The job of the third layer is to protect the body during physical activity from outside influences such as cold, wind and rain. In that way it achieves overarching performance without detracting from the function of the layers underneath.