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The fill is proprietary. Having said that, it's 80g and I'm told it's similar to Climashield/PolarGuard/etc.
As to sizing, I bought a small and it's roomy enough to fit over my trekking layer.
I'm 5'8, 143ish, ~29 inch waist. I also typically wear a small in base layers. The Cocoon items are sized to fit over a similar sized (ie. small vs small) base.
Rough guess, I'd go large for you, and small for your lady.
Edited by simplespirit on 11/29/2010 04:35:43 MST.
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