Have you tried wearing a liner sock? You can get them at walmart in the hunting aisle. They are thin like a dress sock but wick away your sweat from your feet. These and some good wool socks and it will help. Another thing i have is boot insoles where you can slip footwarmers in.

http://www.basspro.com/webapp/wcs/st...10000_500-10-1

These help a lot. Mix that combo with any decent boot and you should be good to go. And i dont put the insoles in til i am on my stand.