I have long maintained that the potential draft situation can be a real fly in the ointment when using quilts rather than sleeping bags. I had a lot of trouble when I first started trying to use my mummy bags as quilt, though many here had great success. In addition to the draft free seal around the neck and shoulders and the tremendous benefits of a hood which can be adjusted down to a breathing hole if needed ( much better than any hat I have used), I always felt like I picked up a little extra back warmth once I got in the bag, with a synthetic bag anyway.
I do better these days with an actual quilt, designed to be used that way, with a snap that allows me to secure it around my neck and tighten it if needed for a "seal". Plus I seem to do a bit better with my bag as quilt.
But both work best if I don't move much, and changing positions requires really paying attention to preventing drafts. Let's face it, no matter how much loft is over you, if you have a poor fit around the neck and shoulders, or develop one when you move, you can lose a ton of warm air around that drafty area.
But the comfort benefits of a quilt in a hammock are so significant as to make solving possible problems worth it for most of us. Still, if I'm using a bag as quilt and I find myself to cold to sleep, I'm getting in that sucker. I've had it change things from cold to toasty warm. I've also had similar help by putting on my ridiculously thick Marmot Dryloft down hood to my quilt. I would think that, at the least, for a quilt to compete warmth wise with a mummy bag of similar loft, you need a separate hood. Like the JRB hood, for example.
I would think a mummy bag as thick as the ORM would keep most folks warm well below 20, maybe as low as zero( especially layered with warm clothing), and need venting at above 30. I figure the ORM would do the same if the drafts can be controlled and a thick hood is used. It seems to me that, when it comes to controlling drafts around the neck and shoulders, wider is better.
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