I wear a size 9 and ordered a size 9. Waaay to small. I sent them back and got a size 11. Still a bit snug, but just around the calf, which I expected.
Not too uncomfortable. They need to break in. They seem warm enough in the snow, but I very highly doubt they are insulated enough for the advertised -40. If they were larger, I could put a couple of good quality felt insoles in them and wear a double set of good wool socks, but they even two sizes larger than I normally wear and they are almost snug with one pair of socks.
Still, not a bad pair of boots, but I wouldn't buy them again and they are a wee but over priced.
At least they aren't Chinese garbage.