I dont see how you all bow hunt with so many layers, the most I can hunt with is about 3: my thermals for first layer, sweat pants and fleece top for second, and ny cabelas late season coveralls. When it gets in the low twenties or less I have actually carried out my mr buddie propane heater and it worked wonders, although the heat rises straight up from it without the fan so you gotta huttle over it.

I just dont have accuracy for crap with piles of clothes on, niether do I have any accuracy when shivering cold. I dont know how they do it further north! More power to you up in canada lol! Originally from Upstate NY myself were I often carried the riffle trudging thorugh a couple feet of snow and wearing snowshoes or skis, but never bowhunted up there past october.