I don't understand how Nubo or Extreme can do it myself. I've hunted in the teens and single digits but it's tough.

If it's going down in the lower teens, I found that doubling my heavy duty thermals, one layer of gortex, another of cottonand then my outer coveralls works pretty good. I'm amazed how much that gortex and cotton layer helps. For my feet, I have 1000 or 1200 gram boots but still need my liners. Two layers of socks I think hurts, but a sock liner under my wool socks helps a lot. I have been known to use battery socks. They work a few hours on 2 d batteries. Gloves I hate but will dawn a heavy one on my shooting hand. I have a problem with the amount of deer I see because you have to be ready to shoot always. That requires my release hand to be exposed to the elements quite a bit.