Berghaus Vapourlight HyperTherm Full Zip Jacket, is fully reversible to offer adaptable performance depending on the weather and activity level. The world's lightest most versatile synthetic mid-layer, that is truly adaptable and highly packable and has been extensively tested on athletes.
The Warmer side (Blue) can be used when the conditions are colder or the user needs more warmth. The wind resistance outer shell stops wind from penetrating the jacket and keeps the heat in. The higher air permeability of the lining rapidly allows perspiration to escape.
The Cooler side (Red) can be used when conditions are good or the user is working hard. It places the highly permeable fabric on the outside, this fabric allows more wind to penetrate its structure and circulate through the insulation, which reduces the heat that is trapped inside and therefore keeping the body cooler.