I have three season and winter Yetis and of course both Black mambas. At winter time I have been using thin CCF pad between layers of BB dl 1.7. Mainly to keep my feet warm. System has been excellent!
But when talking about temperatures below -5 F, I think those are not enough. That is where the Synmat 9 comes in to the picture. And pad would also serve as a backup and cabin use in wintertime as You already suggested.
I guess I should test it if I want to know how it works. But it may be too warm at this early autumn.
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