DW, were you warm last night at 23F, except for the cool spots you mentioned like your right thigh? Have you had the same cool spots using the HHSS without the added CCF pad? With just the HHSS with HH OCF pad/space blanket, how low have you previously been able to go and stay warm? ( for me, 30F is about it without adding kidney/torso pads and/or fleece jackets etc) Am I asking enough questions for you?
Any one know the R value of 1/8" CCF? Is it about 0.5? So you would expect about a 5F boost from that?
You mention "the top of the TQ was quite damp and the down in the top baffle seems to have lost loft from the consecutive nights use." I have had a similar problem when using my down UQs and no VB or space blankets. My breath contacts the top baffle of my UQ, the one nearest my face, and being ice cold huge condensation happens. That is why Shug came up with the fleece frost bib, which I am going to use one of these days. Do you think this is the source of the condensation you report, or do you blame it on the space blanket and/or CCF pad?
For some reason I have never yet had any significant condensation issues with the HHSS and space blanket no matter how I have configured it, except once when I used no space blanket. Other than condensation from my breath on my TQ, which I get with anything I use, including down UQs.
The other night, when you used the WL SSUQ underneath the space blanket in place of the HH OCF pad, did you have significant condensation issues?
Keep up the good work of testing!
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