Mouse
Coyote and wolf fur, and wolverine, are considered to be the best fur for ruffs on parkas, for a reason I guess. They are frost free furs as I recall. Eskimo use a lot of dog skin with fur in mukluks, perhaps inner boots fur in? and prefer the lower leg section of caribou for the tops of boots as it is the right diameter for human mukluks and probably a caribou leg is pretty well adapted to walking in snow.

I'm not sure how often they change their socks, but not all dog hair smells when wet, it seems to vary between breeds and hair/fur type. Perhaps it puts wool to shame, I mean who ever heard of arctic sheep, even though Icelandic wool is very long.
BTW the record low in Komi is minus 76 degrees F.
Jim