If you run or ride a bike outside in cold weather you’ve probably heard that you should wear a second pair of socks to keep your feet warm. Under some circumstances this might be a good idea, but for most people it is horrible advice. Unless your shoes are too big to begin with, a second pair of socks will impede the circulation in your feet—which will make your feet feel colder than they would with just a single pair of socks. Instead of a second pair of socks I would suggest you try sock liners, such as the RedHead ThermoLite Liner Socks.
Many years ago, when I took up cross-country skiing, I used to wear polypropylene sock liners. Polypropylene is a plastic polymer that does an excellent job of wicking water away from the skin, but doesn’t add a lot of warmth. RedHead liner socks are made with Thermolite, a material created by the scientists at DuPont, and it is a comfortable, lightweight but heavy-duty fabric that provides warmth without extra weight, even when it is wet. This fabric has hollow-core fibers that trap air for greater insulation and it dries 50% faster than cotton. Thermolite fabric quickly wicks moisture away from the skin to help prevent chaffing and blisters.
RedHead ThermoLite Liner Socks are made with 70% Thermolite, 28% stretch nylon, and 2% spandex. The are warm and will keep your feet dry. Since the fabric is so thin you will probably not even notice that you have them on. I use this brand of sock liners for all of my outdoor winter activities, from cycling or snowshoeing to just running the snow blower in the driveway.
RedHead ThermoLite Liner Socks retail for $5 a pair and they are worth every penny of the cost. Redhead is the in-house brand of outdoor gear for Bass Pros Shops, so you will have to either visit one of their stores or their Website to buy this product. These liners are available in four sizes (S, M, L, XL). The small liner is designed to fit a woman’s size 4–6 shoe, and the XL liner with fit a man’s size 12–15.