I live on the same latitude as the northern tip of Alaska. And regarding cloths and boots I'd say that if you plan to hike outdoors in the winter time, I'd use layering as Skimo says. The upper body clothes needs to somehow trap air, that you warm up, to isolate your body. And the boots needs to be flexible enough that your feet can move when you walk, so your blood circulation never stops, and they need to isolate enough that air gets trapped, and the cold stays out. Once a body part loses circulation or activity, it will get cold, no matter what material used or how many layers it is.
The sami, the indigenous people in my region, use simple wool and leather shoes, stuffed with hey during the cold winter months. they're flexible enough that the feet never stops moving when they walk, and it's roomy enough that it isolates air, and keeps the worst of the cold out. The same principle should be used in modern day boots and clothing.