Several layers are better than one thick one
because each layer traps air and forms an insulation barrier. The best
materials are ones that allow moisture to pass through them (to wick away
perspiration) while acting as a guard to external temperatures. This
is very important because wet clothes will actually facilitate heat
transfer from the body to the environment because water conducts heat faster
than air. If you perform heavy exercise in the winter such as long
distance running or cross-country skiing, wear multiple layers and shedthe
outer ones as your body gets progressively warmer. This will keep your
perspiration down to a minimum, thus helping to regulate your body
temperature.
2. Wear a Hat
30-40% of heat loss occurs through the head.
A winter cap can help guard against excessive heat loss.
3. Cover Your Nose and Mouth
Use a scarf or other breathable garment to help
reduce water loss through expiration. The garment will trap air to
help warm and moisten the next breath.
