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SOMEONE WHO’D BEEN lost in the wilderness for a few years with only an old-school puffer coat to keep him warm might be surprised, upon re-entering society, to learn how much the tech jacket has changed. The bulky Michelin-Man coat has all but vanished, replaced by its comfortable, comparatively emaciated cousins. One of the sveltest newcomers yet: the Patagonia Micro Puff Hoody, which uses groundbreaking synthetic materials to combat the cold without adding to your load, leaving you clammy, or hogging more than your fair share of space in the subway.

Traditionally,…