Great for X-country skiing, running, snow shoveling, hiking or any other activity outside in the winter when you are going to be moving a lot. These are all you'll ever need for most people as they keep you warm down to 20 degrees. (I've been fine wearing mine in subzero wind chills skiing, as long as you have some warmer layers on top. ) They are incredibly tough. Many, many spills skiing and more than five years later and no rips or tears. The knees don't even look warn out. The 3 sp fabric is almost like a matte neoprene on the outside and cozy fleece on the inside. Granted I don't wear these every day, but use them maybe a dozen times during the winter. I baby them in the wash, using gentle cycle and line dry and they just keep going. Well worth the money.

Sporthill has other great products for skiing and running, but I really think the XC line is the pinnacle.

I wear these for Winter Cycling down to 20f. No themals needed with these. Totally windproof and winter-proof. Comfortable fit.

I use these pants for skate and classic cross country skiing. After 2 seasons, I have had no problems with these pants. The best thing I can say about them is I don't notice them. My legs never get too warm or too cold, and I haven't experienced any chafing or rubbing. For the money, I think they are the best.