But actually the 200 is not usually going to be warm enough for me or I would end up not taking it because of the risk of it not being wamr enough. I need the 233 that Marco estimates to -4 which would be broadly similar to my -6 zpacks quilt (as I understand it anyway). zpacks -6 is not comfort level, but extreme, I think. I'd never use my pack quilt in actual -6. I'm guessing this is the same, but as I type this I'm no longer sure. Marco?
Not sure about Zpacks ratings
Our temperature ratings for quilts are roughly equivalent to the
limit comfort temperatures of the EN rating standard. That’s the temperature you commonly see as the EN rating of a sleeping bag. It’s defined as the temperature at which a standard
man can sleep for 8 hours without waking. For
women, the limit comfort temperature of APEX 200 is +4 ºC and for APEX 233 0 ºC.
That said, and to make things clear, we don’t provide true EN temperature ratings. The EN standard (usually cited as EN 13537 but cancelled by EN 23537 since 2017) is designed to test traditional sleeping bags, not open quilts. As a consequence, the results of testing quilts are not really useful and the margin of confidence depends a lot on quilt design. This is the reason no quilt manufacturer provides real EN ratings. What’s worse, some quilt manufacturers provide temperature ratings that seems to be based on the EN standard, but that’s not really true (none of them provide lab certificates!). Even some sleeping bag manufacturers are not clear (honest?) in this regard. Take into account that testing a single bag has a cost over 2000 €.
