Originally Posted by
Knotty
If the second layer is a Hennessy SuperShelter, then you're may well run into condensation problems. The SS is silnylon, so it doesn't breath. That's not too much of a problem when using the Hennessy open cell foam pad, since you can squeeze the water out, but a sleeping bag won't be so forgiving.
Last night I tried something similar, using a KAQ primaloft underquilt inside a SS. Conditions were as bad as can be for condensation with temps starting in the high 20's and then rising into the 30's with heavy rain and high humidity. By morning my KAQ was soaked, but I did stay warm. Had I used a down underquilt it would have been a very uncomfortable night.
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