The Three W's
A typical layer system consists of an inner "Wicking" layer of thin material to remove moisture from the skin, a thicker middle "Warmth" layer to trap air and provide insulation, and an outer "Weather" layer, a shell to keep off the wind and rain while allowing perspiration to pass through.
 | Wicking Layer
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| Warmth Layer
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| Weather Layer
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A general rule is to be sure that all of your clothes are loose fitting. If the clothing is tight, the outside cold will be able to seep through as the inside heat leaks out at those points, and you will not keep warm. Remember that the layer system will only work when the clothing is loose enough to trap air between the layers.
The secret to staying warm is to wear layers of clothing, control sweating by taking off a layer before you begin to sweat, and to keep out of the wind.
