How warm is wool when used in layering?

I don't have any objective measures, but I'll take fleece over wool any day. It feels much warmer on my skin, and I've used both quite a bit. YMMV.
 
I read some analysis of the clothing worn by the Scott and Amundsen polar expeditions. Scott’s team wore wool. Amundsen’s wore furs. One turned out to be about as good as the other for insulation. The significant difference lay elsewhere. Fur has a low coefficient of friction. Wool has a high one. Layers of fur slid past each other easily. Layers of wool dragged against each other. So Scott’s team worked harder with every move than Amundsen’s men did.

That probably doesn’t matter when you are snow camping for a weekend.

When you are trekking for the pole, chilled, exhausted, on short rations, and lacking stove fuel, it might make a difference.

It’s a consideration I’ve never seen mentioned in these discussions.
 
Not sure how relevant to this discussion, but Scott's team died as I recall. We have, hopefully, learned more in the almost 100 years since.

I asked about water load that wool can take because the wool trade associations, not famous for being anti-wool, only claim 30-33% by weight absorption before wool feels wet. So if someone has measured 90%, I'd like to know about that.

No doubt wool is an amazing material.
 
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