Although I empathize with those in freezing regions, I am curious how comfortable it would be to hike all day in freezing weather with a really good/warm outfit on. I would guess that with sufficient face, hands, and feet protection, you could walk around all day in super-cold temperatures. I guess you would need some kind of spiked cleats to avoid slipping on the ice, and maybe some kind of ventilation mask to filter the outside air through in between your layers before putting it into your lungs, but if you did all that, how cold of temperatures could you comfortably spend the whole day outdoors walking? And how annoying would it be to breathe through a tube and look at everything through a face mask for all that time?