The Rab down pants must have a different shell than their synthetic ones. I'll have to look that up. My synthetic Rabs have reinforced seat and knees, seem to be a heavier outer shell, but they aren't on the level of warmth of good down pants, but that's just to be expected.The Gruman are warmer than the SDU. Very warm like the Kuiu Pro. Great piece of gear.
Yes, the Kuiu Pro is worth the extra money.
The Rab pants tear when you look at them or at least they did for me.
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