Yeah, i can attest to this. Especially in temps below 10deg F, always find a thin layer of frost on the top shell of my down bags, and sometimes some sections are frozen stiff if I don't use a VBL. Synthetics seem to show it more on the outside from my experience, which really makes me wonder how much is trapped inside the down.
I wouldn't want a VBL top quilt for anything above consistent less-than-20ish temps, but I definitely want a cuben UQ, which I would use under pretty much any circumstances depending on fill.
Originally Posted by bigwig
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