>>2753140they're a little over rated, but I use anyways for the warranty.
I live in pacific northwest and only use the thickest grade they have.
you want ideally 80% of wool or higher. When you get to 70% or lower they start to feel clammy which is a lot of their socks.
don't bother with coolmax ones either. they are not worth your time. wool does a good job at regulating body temp.
they reason i think they are a bit over rated as the 'best' is they are fit like an athletic sock. they are too tight like a tube-like fit. If you size up they don't get wider either, but just longer. Again, tube.
I find it constricting around the toebox and the ankle. They hold on well, but that is my two cents. They are a super dense knit which I think also doesn't insulate as well. Now not saying this is the worst thing either as I have had loose knit wool socks from wool power that didn't last long at all. This is why I still go with darn toughs at end of the day.
I used Bass Pro's lifetime guarantee socks that cost $10 a decade ago before they discontinued it and those were loose, heavy on the wool and overall the best.