I'll second the idea of the silk long underwear. I wore out a set from Eddie Bauer walking my dog in Toronto winters. Loved them, and no bulk or weight at all. I still wear the ragged top sometimes, haven't bought another set, since my dog is long gone, but now I certainly will do so if and when we go to Alaska!!

Wendy
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Booked: Uniworld Egypt, 2015
Tauck Amsterdam to Budapest, 2016
Paul Gauguin, Societies & Tuamotus 2016