A couple years back a pard invited me along to help him with a bison hunt in AK in February. I opted for a pair of NEOs Navigator overshoes that I wore over uninsulated hikers with good wool socks. My feet did not get cold at all and we saw temps as low as -24ºF. They were a snug enough fit that I had no problem hiking in them. Climbed some pretty steep country chasing ptarmigan after the bison was shot. No problem with them there either. I am very happy with them. Even used them here in IN deer hunting with nothing but a pair of tennis shoes underneath. Again, no cold feet. Told a buddy about them and he scored some for his son off eBay for $40!
https://www.overshoesneos.com/Overshoes_Neos_Navigator_5.html
