Jacket- Heat Dump and back sweat ?

[undercover]

Just came back from a slow stroll wind bumping some whitetail bedding area, it’s 32deg, WNW wind 10 mph with gusts to 20ish. I put 1.4miles on the boots, dressed on the lightside, baselayer top, mid layer insulation and a Spider wind resistant jacket with zero zips for dumping humidity. Came home took off top 2 layers and my back was drenched. No pack only rifle and chest pack for binos. My question is: would pit zips remove heat/humidity for the back area? My arm pits were bone dry, my phone which I kept in my chest zip exterior pocket was also damp. I didn’t really exert much on the hunt, almost like a Sunday stroll. What jacket would you recommend for this type of hunting? I guess I was holding some pretty good heat. Thanks for your help….Blessings from Michigan

 

[Wrong Burgundy]

This kind of layering is pretty popular for the conditions you are describing. There are other cheaper options on the market, but the science behind it is pretty solid. I have not tried them yet, but nordic skiers, climbers, etc. are fans of this kind of layering. Something to consider.
I typically avoid a fully windproof layer as when I am moving and creating heat/moisture, I rarely can dissipate enough heat when on the move to offset the windproof function, so no matter what I will get sweaty. I like to dress light enough to "start cold" when I leave the truck, and know that I will warm up enough to just keep me comfortable without fully overheating and sweating. When I stop, I throw on the puffy and may even swap out for a dry fleece hat, depending on if I am going to glass for a while, etc.

Brynje USA – The Lightest, warmest, driest base layer you will ever own.

www.brynjeusa.com

 

[noharleyyet]

Picked up a used Kuiu puffy w/pit zips from someone here...handy little thermostat

 

[GrantK]

Pit zips help some but if you're generating any real heat in a hardshell they won't dump enough, if it isn't too wet or windy a softshell would do a better job of dumping moisture.
It's also possible that your insulation layer is not super breathable and is holding on to some moisture as well.