Some mountain climbers use vapor-barrier socks to keep double-layered boots dry. These boots have a warm removable inner liner and a plastic outer shell. The plaster outer shell keeps out moisture, but because the boots don’t breathe, perspiration soaks the socks and liner which can then freeze. Vapor barrier (VP) sock are used to prevent this problem. The VP socks hold in the moisture to keep the boot dry.
With the right winter backpacking gear, you can be warm, dry, and comfortable while snowshoeing or hanging around your camp in the snow.
Truth 1: Circulation equals warmth.
Make sure your boots fit correctly. Not too loose or too tight. If your boots are too tight-blood circulation will be reduced causing your feet to become cold, especially when you are not moving. Overly-tight boots often occur when hikers use their three-season hiking boots with thicker wool socks or layer socks with sock liners.