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I have a Catabatic that I love, which does have a Quantum bottom panel (.8 oz fabric, I think). I almost always use it in a bivy sack, so I think/hope the bottom will wear fine.
Venting is expected to take place through the bottom fabric when temperatures climb--you roll slightly sideways to expose more or less of the bottom--but I've only used it below 30. (In fact, down to 3 degrees F one night on a Stephenson Down Air Mat pad; I wasn't toasty, but I wasn't freezing, and of course I was wearing everything I could.)
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