Hmmm ... my experience is that the latter leads to the former.
@THLR?
The arctic studies at University of Tromsø used to have a good research paper in the public domain; I could not find it right now.
To heat and dry moisture on your skin requires an inordinate amount of energy compared to just staying dry/drier. In a coastal saltwater climate even worse.
In the colder climate, it also changes your blood. I cannot remember the words, but the short of it is that the heart works harder and you don't restitute nearly as well. "The NATO gait" as the tendons get a little stiff and allied soldiers in for winter training tend to walk a little funny at the end of the week.
This is not really relevant for normal hunting as most wouldn't hunt in that weather or push that hard.
But yeah, being wet really adds to that downwards spiral, especially if you add a little wind. Pretty sure a little google-fu will reveal the science behind it.
So dressing correctly REALLY helps with comfort and longevity, for me this means ability to pay attention and glass properly.
I bought the Sitka Ambient. It's basically an airy, fluffy fleece towel with a surface fabric, so should help moving moisture away from my skin. Good hood, wish the Mountain Evo had the same coverage!
(a $220 jacket landed at $530 with exchange rate/shipping/import taxes, so a really stupid choice compared to an Rab/Mountain Equipment jacket)