I normally have a problem with all my toes falling asleep and getting numb when its even a little bit cold out. And I dislike getting sealskins on and off. These are pretty darn good ... I still have numb little toes but its warmer than my summer shoes with sealskins, and much more comfortable. The soles are nice and stiff, with very little flex or slop given the level of comfort. Maybe the Sidi's are better? I'd have to spend twice as much to find out.