Check these guys out. I will be getting a pair of the 18oz pants for this fall.
I have a thin pair of first lite pants that I bought a few years ago that have been awesome for hunting. The obsidian foundry. As the weather gets colder I just layered under them with wool under layers. Incredible to see the temps that I have been out in them and staying warm.
https://www.gostwear.com/advanced_se...996e8e3b3820dc