Winter Underwear - The Base Layer (Foundation)
The base layer is the layer next to the skin underwear,
or in cold climates, "thermal" underwear. Despite cold
temperatures, perspiration is still a problem, in fact it can
be more so than in a temperate climate. The body loses moisture
at almost all times whether undergoing any great level of exertion
or not. If there are numerous insulating layers keeping you
warm, then it is more difficult for the perspiration to be able
to escape. If the perspiration is not removed it will result
in the wearer becoming uncomfortable and a feeling of "clamminess"
as well as decreasing the efficiency of the insulating layers.
Arctic / Antarctic, Cold Weather, Thermal Clothing
Underwear that is able to wick this moisture away from the skin surface therefore becomes much more important and this is an important factor in choosing garments. Modern "thermals" are made of synthetic fibers such and polypropylene or "fleece" that have good insulating properties and are also able to efficiently wick moisture away from the skin. A golden rule is to avoid cotton.