It says its rated to -40 but so do my boots which suck after -15.
The -40 rating on your boots is an "ATR" (Active Temperature Rating), which means that you must be doing something active to achieve warmth in such a harsh temperature. And in -40 temps, you had better be snowshoeing up a bigass hill or running from a hungry pack of wolves, or maybe just walking very fast for a long time.
As soon as you stop, your -40 boots are about as good my running shoes in 0ºC temps - useless.
And keep in mind, ANY bit of skin that is exposed to the air will be losing major heat, and your body will be sucking blood from the extremities (feet, hands, junk) and they will be the first to get cold. So now your -40 boots are doing nothing to keep you warm because there are other factors like your nose, lips, ears, wrists, etc that are exposed to the air and preventing your feet from receiving blood and in turn warming up.




























Or... forget about the boots, move somewhere warmer.





















