Seeking Recommendations for Thermal Base Layers for Extreme Cold

Awaiting Flair
1

I hunt late season in a tree stand in the northeast, my current system consist of:

Base Layer: Smartwool merino intraknit

Thermal Layer: Cabela’s polar weight thermal (discontinued and doesn’t fit anymore)

Mid Layer: Sitka Mid-layer jacket and Stratus pant (Electric heated vest under this)

Outer Layer: Sitka Incinerator Aerolite Jacket and bib

I’m looking for a replacement/Upgrade for the Cabela’s thermal layer and would prefer something warmer. I’m hunting all the way down to sub-zero temps without moving for hours. with wind chill I’ve sat all the way down to -20. If anyone has any recommendations for EXTREME cold layers id appreciate it. The last requirement is that it goes between my wool base and Sitka mid layer. Price isn’t really a factor, buy once cry once for something that will keep me from freezing to death.

Edit: Since I sit and don’t move around I’m prioritizing WARMTH above all, not super concerned with wicking, also the rest of my gear works amazing and the thermal layer is the last one I’m looking to upgrade

2

For a base layer, you might try a mesh base layer, which is great for wicking away moisture. For a mid layer, consider something like alpha direct or mountain hardware air mesh, though they can be pricey and hard to find. A simple fleece jacket can also work well, like the REI trail made fleece. For a shell, a light windbreaker should suffice, and for a static layer when you’re not moving, a down jacket or puffy would keep you warm.

3

I’m following this discussion because I’m curious about similar options. How effective do you find the merino wool base layer in wicking moisture?

4

Brogan said:
I’m following this discussion because I’m curious about similar options. How effective do you find the merino wool base layer in wicking moisture?

The merino wool base layer wicks moisture well, the best I’ve experienced. However, it’s not perfect; when dragging a deer up a mountain, it can only handle so much sweat, but since it’s wool, it still insulates when wet.

5

Brogan said:
I’m following this discussion because I’m curious about similar options. How effective do you find the merino wool base layer in wicking moisture?

Merino wool is somewhat overrated in my opinion. It absorbs water and isn’t very durable or breathable, though it does offer good odor resistance. Consider trying mesh base layers or a comfortable polyester shirt.

6

Merino wool is excellent for moisture wicking and will keep you warm even if wet. However, it makes me itchy, so I use Patagonia synthetic base layers instead. For extreme cold, I also use instant hand warmers and electric socks or under layers, which significantly improve comfort.

7

@Jules
I use a heavy Smartwool next to my skin and am looking for something thicker for over that but under my mid layer. I already use toe warmers and an electric vest, but I need something more to reach true comfort.

8

If traditional layers aren’t enough, consider looking into expedition suits like those from Feathered Friends or Mountain Hardware that are used in extreme environments like Everest.

9

For really cold weather, I use Woolpower 400 leggings and Ruskovilla outdoor pants underneath.

10

Have you considered down trousers? They might be bulky but are warm. Also, ensure you’re sitting on something insulated to avoid heat loss.

11

I recommend Terramar products. I have their union suit and plan to get the separate top and bottom soon. They might fit your needs for an additional thermal layer.