Boot Insulation

[idcwby]

Education me on boot insulation. I have had a pair of 400g Danner Santiam, they have always kept my feet warm in below zero and snow conditions, but they are not the best boot for hunting the steep country I like to hunt. I bought a pair of Scheels West River, made by Crispi, 400g boots and my feet froze this year hunting. I would put my uninsulated Crispi Guides on and my feet would stay warmer than the West Rivers. Crispi suggested I go with the 800g Wild Rocks. Is that necessary? That seems like a big jump in insulation.
Any ideas?
What makes the Danner warmer?

 

[Colorado Cowboy]

Do your feet sweat a lot? I believe boots that breath and let some moisture out are warmer.

 

[idcwby]

No, I really got to be hauling some weight to get my feet sweating in the cold weather.

 

[buckbull]

Same socks? Do the different boots fit different, boots to tight restrict blood flow and the insulation will not work as well in a tight fitting boot.

 

[idcwby]

Same socks, even tried different socks seeing if that might have been the reason. The Danner is a tighter fitting boot than the West River.

 

[Hilltop]

My uninsulated Danners are warmer than a couple other brands I have with light insulation. I think they are just a warm boot.

 

[JimP]

I'm not much help but it feels like my Chrispi Colorado uninsulated are actually warmer than some of the boots that I had back in the 60's and early 70's.

But saying that I have not had any problems keeping my feet warm as long as I didn't try to go swimming with my boots. I had some 800 gm insulated ones and my feet kept the rest of my body warm with all the heat that they put off. After that I have stuck with 400 gm ones and they have been great for me. It hasn't mattered what brand.