what have you been doing? I'm thinking clothes that dry very quickly and chem packs, a lot of them. Putting chem packs over you kidneys real helps keep your fingers and toes warm.

I did try some silk last year that kept me warm, but I'm puzzled how. They were wet with perspiration when I took them off. They did work.

Loose fitting for all but the base layer especially the socks/ boots/gloves. Anything tight will restrict blood flow and warm blood is a must (why the chem/kidney works. it warms your blood)

Absolutely no fleece as a base layer. I did once, the stuff doesn't absorb moisture and very quickly you feel like your in a swimming pool only very yucky. Great as a layer after an extreme moisture wicking layer and with the extreme stuff you need something to lock in warmth.

Out of everything the chem packs on the kidneys has made the biggest change for me, more than any clothes. With clothes you get warm but cool off. With the chem packs, your sitting there and it suddenly dawns on you that your hands and feet are not cold. Having a pocket in your clothes for the packs is good but a base layer like UA keeps the in place fairly well.