I'm wondering if my full leather uppers hiking boots will be sufficient to keep me warm around camp in down to potentially negative 10 degree weather. I have REI full leather boots with Gore Tex, and they are plenty warm for daytime temps.

I'm assuming a light synthetic wicking sock with a heavy or expedition weight wool sock is still the best? Any other techniques?

I have some down booties I would like to incorporate, but I don't think they will fit into my boots, or survive wearing alone around camp.

What do you guys think?