Sealskinz took their original waterproof sock and beefed it up to take on both the cold and rain. Wet feet can lead to all sorts of not-so-good things outdoors, including numbness, blisters, and frostbite. The Waterproof Cold Weather Mids will keep you dry and warm in leaky waders, through stream crossings, and in rain, snow, and mud. Around the clock protection, we like to think that every person should keep a pair in their pack -- just in case.