Brynje's fish net long underwear as first layer,nothing else wicks like this stuff.Second layer either Patagonia Capilene or smart wool long underwear.Both come in various weights.Last layer before outer garment would be Ulfrotte wool long underwear,also comes in various weights.
I can't emphasize enough how well the Brynje's stuff wicks! I think the most important thing is to stay dry and to start out feeling cold and adding layers as needed,unfortunately if someone is covering ground in cold weather a pack will be necessary to carry the layers that you wont need while moving.
If anyone needs contact information for any of the companies mentioned let me know!