I have switched to wool for the most part. Smartwool to be specific, longs are excellent. They are super soft and non-itchy and handle moisture very well. I have almost completely abandoned my capiliene in favor of these and have absolutely done so in dry cold. I have two weights of Smartwool bottoms and both are superior in every way to any plastic underwear I have ever used.

Byrnje poly string is excellent for high mositure activities like cross-country skiing, and combined with Smartwool on top of them it is a super combo for very cold.

The wool tops I use are: Icebreaker, Smartwool and Filson. The first two are much softer wool than the Filson which I only use as an outer layer top.