Do your feet stay wet, cold and clammy when you're hiking, biking, skiing, snowboarding, exercising, etc? You might want to try some thin polypropylene sock liners by Fox River Mills. Polypropylene sock liners are great for warm or cold weather. The polypropylene fabric is designed to keep your feet nice and dry helping your feet to regulate their temperature better. Polypro sock liners are especially nice in the winter time because they add a layer of warmth to your feet while keeping them dry. Polypropylene retains more heat than any other fabric and it also absorbs less water than any other fabric. If you have trouble with smelly feet, you'll want the Fox River Polypro socks with x-static. X-static is an anti-bacteria fabric that prevents odor causing bacteria from developing in your socks.