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Why no down? Because most of us don't slow down enough to minimize internal moisture production. The backpack is a huge vapor barrier. Down gets wet. If it's really cold, and you are prepared to limit how hard you work, a vapor barrier with down can work well.
When I am activity backpacking or snowshoeing R1 hoody + shell has almost always been enough for me. Other activities like downhill skiing is when I most often find they aren't enough. When I have needed a vest while backpacking, I typically have used a thermwrap vest. lighter and more compact, and I like the way it doesn't feel constraining. Doesn't breath as well as fleece, but is more wind resistant. I tend to use shells that are only wind resistant. If it's gotten cold enough that my active doesn't keep me warm, I often want extra protection from the wind.
As to warmth, there is richard's iclo graph of backpacker's insulation
--Mark
Edited by verber on 01/25/2011 19:23:38 MST.
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