That’s probably a bit colder than what I’ve shown them, probably around -25 to -30 at the coldest. I would definitely not describe these things as warm, and I definitely have “winter socks” that I wear with them. Even then, my feet will get cold unless I’m at least moderately active.
My feet are slightly wide, all the way down, but very thick. These boots are the only ones I’ve ever found that actually fit well, probably because the boot itself is very flexible and malleable.
I don’t know if they’ll fit your “extremely wide” feet, though. They do have a few sizing guides that might help you answer that question?
I don’t know if they’re BIFL, but I bought a pair of Farmer Boots from RealFoot a few years back. Like all leather goods, they need proper care, but five years in and the only real sign of wear/tear is colour changes in the leather.
Magic Earth provides traffic services. It is a yearly subscription, but it is already available.