-36 Celsius this morning, with a windchill rated at -46 Celsius.
Thats cold, no matter how you look at it.
Lite poly-pro base layer, heavy poly-pro underwear, military woolie-pullie, vest, jacket.
Helly Hansen lite watch cap, under a heavy fleece watch cap (toque, or stocking cap)
Military cold weather mitts, with Helly Hansen lite liner gloves.
Neoprene face mask, UV googles (Ski type)
Heavy felt pac boots, with silk liner socks, lite merino wool socks, and heavy wool socks.
Light wool pants, with heavy wool pants over those.
I carry the heater packets for warming hands and feet, on the long days, too.
The pack has extra socks, extra mitts, extra toque, a mylar survival bag, fire starter kit, etc. Along with lots of food, and medications, in case I am stuck somewhere.
Just have to dress for the deep freeze, and be prepared.
(You must not mind the odd bit of frostbite, either!
)