I used to wear wool base layer next to my skin, but I found by switching to fleece as the base layer, and one layer of wool long johns keeps me warm in freezing weather. It is fleece so it seems to want to stick to your jeans when you put them on, but put a wool layer over the top and I solved my problem. Best combo I have found.
I ordered these use as a base layer for backpacking in below freezing temperatures and they are exactly what I was looking for. Very warm and comfortable.
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