Since I won't be crawling around in the snow with a firearm I'll be wearing nice bright colours (since I'll be in Canada) so they can find me if I get lost. At temps of -20F and lower I'd prefer to be found, in a revivable condition if at all possible.

But I do know all of the old tricks for surviving the cold: keep on the lee side whenever possible, stay dry, don't touch metal with your bare hands, no exposed skin, watch for the white patches that mean frostbite, and above all stay indoors, before a nice fire, in a comfortable lounger, while sipping a hot buttered rum or a hot ruttered bum or both.