Wow old thread but cool to come back and hear what worked, isnt denier pentex synthetic? But i noticed they make a pant the same way so if its that warm this might be the ticket for those -0 + wind chill days we hunt in January here in the north east as long as you dont have to keep removing it cause its too warm
Oh yeah, it's definitely synthetic, but I rationalize it because down is natural :P At least having this one layer let's me use wool and alpaca for all of my other layers and be warm.
I came to the conclusion I could be a purist or I could be warm. I've tried every combination of natural fibers possible (alpaca, possum, cashmere, silk, yak fiber, several different kinds of wool) and I just can't stay warm when I'm sitting completely still for multiple hours in a tree stand or on the ground in 10F or colder. And where I live, that can be a significant portion of the late season.
As to whether you would have to keep removing them...that will depend on a lot of factors, most notably how you like to hunt and your body. If you're getting up and moving a lot it's probably going to be too warm, I know I can't walk around for more than a few minutes with them on without starting to overheat. But if you're sitting still 3-8+ hours I don't foresee you having to remove them at all. But the caveat I will give is that I think movement effects me more than most people when it comes to body temperature. If I'm moving I can be comfortable in very little and overheat easily if I wear too much, but if I'm sitting still I struggle to keep warm. The opening day of rifle this year it was 18F, with a windchill factor of -1F and when I walked out I was fine in my woolnet baselayer and a thin alpaca hoodie, but as soon as I sit down I need something really warm over top within 15-20 minutes.
I like to pick a spot and sit for 3-8+ hours, and it works perfectly for me when I'm just sitting still waiting for something to come by. I just take them off when it's time for me to pack up for the day and head back in, or if I decide midday I want to go sit somewhere else. I loved the vest so much I got the pants too, and some down booties from a different company. It's great because the down packs down nicely so you can fit it easily in your pack and it's super light. I just hike out in very light clothes, throw the vest and pants on over my light clothes when I get close to where I'm going to sit and then put my wool bibs and wool pullover on over top and sit down, then reverse the process when I want to leave.
But that is my experience. Your mileage may vary.
Also worth mentioning is that they are expensive pieces of equipment and I realize that's not for everyone. Just what has worked for me, and in the end it's worth it for me.