What's the best midlayer jacket for winter backpacking?

What's the best midlayer jacket for winter backpacking?

Hi! I'm trying to decide on a jacket to use as an insulating midlayer for backpacking this winter. I want one that's warm while sedentary, but really breathable while doing aerobic activity. I’m not sure what to go with: fleece, soft shell, or down? The Arc’teryx Hercules jacket seems to be promising because of the high loft fleece interior and superior breathability, although I'm concerned it might not be warm enough. The mercury usually dips into the low teens here in late winter. Any advice? Matt Birmingh, AL

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