Following the layer principle, this time we are going to talk about our outer layers. There are two types of layers to add above the mid-layers: windproof shells, and warmth layers. The shells protect us from the elements and help to stop wind and snow, basically like a rain jacket. They are usually lightweight and don’t add any insulation themselves. While we are on the move, we will usually not wear any additional layers, but once we stop, we need to at least add a down jacket to prevent us from cooling down too fast. The head and hands are our body parts requiring the most additional protection from the elements. Our head, because you lose a lot of heat if you don’t cover it, and of course because our eyes, mouth, and nose sit there. And our hands, because they are exposed to the wind and snow a lot and thus freeze most easily.