Spent some time hiking in sub zero weather, wind chill was in the 25 to 30 below range. Ambient at -12 when I went in, -13 when I made it back to the truck. Some bushcraftin' and cookin' on the mountain. Night hike out to test a new Zebra Light.
I wore multiple layers, including a puffy under the outer jacket and still didn't over heat. The First Lite merino base layers are the best I've used and I've used a lot of different names. After two years of trying and comparing them to what Kuiu has to offer as well as Core4 and several others the First Lite layers have outlasted all others.
An interesting note on clothing this trip, the outer layer this time was nothing more than a 50% cotton 50% polyester hoodie type jacket. Because of the multiple layers beneath and maintaining a very breathable outer layer I was more comfortable than usual. On the way out the wind was up a and I wasn't sheltered as well as I had be so I put the Kryptek Koldo rain jacket back on. I know it's a rain jacket but it's also great as a wind blocking layer, the venting zips make it a nice option when activity levels are up.
I'm liking the Fallraven rucksack, holds more than enough for a day out and is comfortable to carry. Needs a sternum strap which I'm making for it. Otherwise it is a nice bush crafting day hiking pack.
Steel this go round was from Adventure Sworn and a Beck along with the Laplander.