Ya, I think getting pinned down on the Cassin would be desperate even with the warmist of gear!
I've been super happy with my DAS up north in Canada, so that got me thinking if with a baselayer, R1 hoody, 300 weight fleece pullover, shell jacket and a micopuff vest - that maybe the DAS would be a good enough option for something committing in the Alaska range?
In either case I was planning on bringing some micropuff pants to go over my winter weight softshell pants.