While I agree with liquidorange's comment about paying attention to all areas of the body (especially the head). I have sweaty feet and it took a lot of trial and error to keep my toes warm when its cold outside. #1 is a polypro sockliner (my brand prefence is Helly Hansen), #2 temp. appropriate weight wool sock and #3 matching the footwear to the situation. In regards to #3 if I will be moving I wear lighter insulation. If sitting I wear in gortex boots and sockliners, then once in stand switch my socks to dry liners and wool, finally put on my pac boots and leave them loosely tied. When it comes to choosing boot and sock combos it is essential to have wiggle room, to tight is a receipe for cold feet. As mentioned when sitting for a period I like to keep my boots loosely tied to help with circulation. Also getting the feet up off the stand base or frozen ground will help. Hot packs are agod sentand can be placed in boots, hands, jacket, pocket, etc.

Other things to remember is fuel up properly prior to the hunt, eat foods like oatmeal, trail mix, PBJ sandwiches, etc. Avoid caffine as it thins the blood and causes one to loose body core temperature as a result. For me and others it also makes one unzip more frequently and we know what that means. If you need something warm take cup of soup or even hot water in your thermos instead. Circulation is a key to warmth, so make sure you keep the blood flowing by doing arm/leg cirlces, stretch, etc