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On the question of drafts with a quilt... I didn't notice any problem when I start my Ghost in the summer of 2004. As it got colder into the fall I sometimes woke up due to drafts. After the experience of 2-3 trips using a quilt in colder weather I found that I rarely had problems because I found a use pattern that worked well for me. I used a bivy for around a year and ended up getting rid of it. I found I didn't need it, and disliked feeling constrained.
There is no need to feel like you are roasting. My view is that if you can fall asleep reasonably quickly, you don't wake up because you felt too cold, and your shiver mechanism doesn't fire... then you are right on the money.
As others have noted... your hat makes a big difference. You want something that covers not just your head, but also your neck. If you are using a open tarp or tarptent you really want something that is windproof. For me, a basic wool beenie or fleece hat would not cut it at 30F. When it dropped to 30F I used to use a PolarBuff around my neck and a GoLite Snowcap for my head. These days I am using a Down Baklava. It makes a HUGE difference in how warm I stay.
As to "have I adjusted to colder"? I don't know. When I first started using the Ghost I thought that I started to get too chilled to sleep below 35F. At the time I was wearing mid-weight base, wool socks, and a heavy wool hat. These days I am happy to 30F wearing my Cloudveil Spinner pants, featherweight base, and down Baklava... and was warm enough down to 10F with the addition of a thermawrap vest.
The real question is how much of a safety margin do you want to give yourself. My approach is that I look at the weather forecast near where I am going, adjust for elevation, and drop that number of 5F. I bring something that should keep me warm enough to sleep without problems without depending on one of my insulation layers. Now to 25F that means sleeping my my base + hat. Below 25F it means sleeping in thermawrap vest, while keeping my thermwrap jacket in reserve. This allows me to sleep comfortably if the temp 15F less than expected, and survive (though not sleep well if the temp is 30F lower than expected. So far, I have never been on a trip that was 30F less than expected, a few that were the temp was 15-25F lower than expected, and several trips that were ~15F below what I expected.
Edited by verber on 02/25/2008 18:40:28 MST.
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