sureshot
The Hunt Never Ends....
I wear 800 gram boots all year and do fine with them. One thing I do to make this work though is like others have said, wear a good liner sock with a merino wool sock. Merino wool is very warm and also wicks away sweat. LaCrosse sells felt soles that you can put into your boots as well, which increases the warmth quite a bit in my opinion. The felt liners are under $10, so a good investment.