I live in Bethel, AK and I work outside at the airport all day. Its hard to find good gear that can keep you warm in these conditions. -45 to -56 I can say for a fact. These boots kept me warm!
They are actually water proof too! The grip on the soles aren't too bad on the ice either. The comfort they provide is like wearing a tennis shoe. Thats super handy out here and I have bragged to everyone here at work about how wonderful these boots are. I highly recommend these boots! Well worth every cent! The only negative could be that they can cause your feet to sweat when its not extremely cold.