Get really good,warm boots!
Sitting on stand used to freeze my feet even with 800 gram boots.
2 years ago a friend of mine and me went out in 9 below weather. My feet were like bricks in about an hour.
That night I said "screw that" and went online looking for boots.
I bought a pair from Cabela's that have 3"of insulation under your foot. I paid to have them next day air delivered so I would have them for the next weekend.
They make you hit your head on stuff you never did before but man are they warm!
Best 170.00 I ever spent on boots.

Handwarmers,layers of clothing,a good warm hat and a fleece balaclave(sp) and I am set for any weather.
I hunt thru the middle of January in Iowa so you need warm gear!