On a super cold day I will go with the following. Merino socks, light merino base, midweight base pant, azzpad ( aside from tailbone protection is is nice to have between you and the lift seat) and then whichever shell pant I decide on. On my upper half a compression top, then midweight base layer top, polyfill sewater ( same idea as the down sweater but a bit cheaper), then a shell with a polyfil vest either above or under it. I do have insulated pants and jackets but have never had it get cold enough to need them.
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