[Ray Zee]

polypropelene is warmest and wicks away moister the best. but all the fake materials hold in the body odor.
the secret to staying marm in cold weather is to never exert yourself to where you sweat. then you dont get wet and get cold. nopen up you coat as you exercise more.

i wear almost all natural fibers in the coldest of winter and do fine. except for my outer coat sometimes and that may be down and nylon, or thinsulate.