Outdoor cold weather sports are the very best source of exercise, and fresh air, IF you are
 warm, dry, and comfortable. The most important element to achieve this, is the right base layer. The Duofold Silkweight Dri-release base layer is my choice.
I wore them yesterday on a snowboard trip in the Colorado Rockies. After a couple of hours of shredding through the snow, I collapsed my exhausted body into a snowbank to breathe, and realized that I was warm as toast, and had no sign of rubbing or abrasion anywhere on my body.
I was a little surprised, because snow riding requires constant twisting bending, and falling
down the mountain. On the lift, at 10 degrees F. with a 10 mi/hr wind it was great, but 1/3 of the way down the hill, I was gasping for air(10,000 ft above sea level can cause this), and
sweating under my 3 layers of clothing. This moisture will pull the heat right out of your body.
This is where the Dri-Release comes in. The moisture wicks to the outside of the material, and evaporates keeping you dry and warm. Silkweight, may be misleading. They are thinner, and lighter than my old longjohns,  but thicker than silk, thank goodness. The waistband is what
really made me smile. Most of the elastic waisted items that I try on are too tight on my middle aged belly. This was ample enough to be comfortable, and wide enough to be comfortable.
Cold weather sports are no fun, when you're cold. I just bought another set of top and bottoms, and can't wait for the spring run off, because I'll be wearing the same base layer on the same snow during the high water rafting season.