I think I've grown immune to the cold. It bothers me maybe for a day or two when the weather first makes a dramatic "winter change". After that your body adjust to it pretty quickly. On calm days without the wind it really doesn't bother me at all especially if there's a little sun out. When the wind is blowing on top of the single didgit or below temps, then it can get pretty brutal. Days like that I just shorten up my hunts by an hour in the morning and afternoon so I don't get stuck to a tree out there.