For cold and wet weather, many layers of clothing should be involved, preferably with synthetic materials underneath it all. This means that your socks, underwear, long johns and other base clothing should be made of things like polypropylene, nylon, and rayon. Wool is fine, too, but it can be scratchy, so opt for merino if you go the wool route. Mid-layer shirts, sweaters, pants and hats can be wool or synthetic. Outer layers, like coats, jackets and rain wear, should be breathable yet waterproof synthetics like Gore-Tex or comparable products. Select outerwear with hoods to add warmth when needed. Pick garments with lots of pockets to hold spare survival gear.