I got some pants at mec that are fairly baggy a few years ago. With long jons underneath they were good to -15. I like the air gap, helps keep the wind from biting. For top I'll wear one or 2 merino wool shirts, a fleece MEC jersey and a wind breaker for -15. That is the worst I had to deal with last year. Oh and toe thingies for the tootsies.
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