coldpack: I am not about to argue with the wool suggestions, but I do want to offer an alternative. In my view, polypros (polypropylene) is an excellent base layer. I was issued mine in army basic and I am still using them (sometimes even for the army 😆 ). Check out http://www.adsinc.com. They make quite a bit of cold weather stuff for the military. You could also check out some military surplus stores or some online auctions. Hope this helps. Be well.