Substantial, very warm, but very breathable: 100% merino wool layers in various combinations. My favorite combo for below 45F: a merino thin soft base layer, a soft merino zip turtleneck, and a soft wool vest.
I have a gore biking jacket and it totally makes me sweat- doesn't breathe at all. I put on my wool instead and I feel great and cozy in the extreme cold and I don't get drenched in sweat. Just my 2 cents.




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