First of all, let me say that I love down. It is the only material I will consider in a sleeping bag or cold weather quilt. However, I wear synthetic insulation, (Patagonia Micro Puff Jacket & Pants), similar to the Thermawrap
I too, hike in the White Mountains of NH. I have a vacation place up there and I live in Florida. Therefore, I deal with wet environments (although I don’t need the insulation in Florida; I’m waiting for someone to invent an UL solar powered air-conditioned suit).
My thinking is that I can keep a down sleeping bag dry because I store it in a dry bag and only take it out in the shelter of my tent. However, in camp, I need to wear insulation because I’m not creating my own heat like I am when I’m huffing & puffing up & down those mountains. But, I’m not confident that I can keep my worn insulation dry as I cook, clean, hang bear bags, visit the latrine, etc.
Now, if I can just convince Bill Fornshell that his next project should be that air-conditioned suit,…