I live up north (-20 F). When I plan to work outside for awhile I wear boots with felt liners a pair of heavy wool socks and cotton socks next to my feet which I wash and make sure are absolutely dry. I was reading about liner socks (Polypropylene) that wicks the moisture away from the skin. The body apparently keeps the skin surface moist so that it would not become to dry and peel, blister, etc. The moisture constantly evaporates inside the boot. Cotton dosen’t work. There is also a waterproof liner that can go over the first liner and then wear a heavy wool sock that always dry. Any comments? Thanks