Great idea Sgt. Rock! I love it! I think I'll make one myself. This past weekend I used an IX sock and it got down to 12°F or so. Getting in/out was more difficult than I would like and I actually tore the IX when my foot caught the edge of the sock. Having a WHUG would be much better, IMO.
In fact, I wonder if you made the WHUG with a foot box -- almost like a half bivy sack? I like bouncing ideas...
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