Re: How much insulation is in your hunting boots?
Boot insulation is a myth or misunderstood. Feet get cold from sinking cold through the sole, not so much the upper. Many boots do not have good, correct or any insulation under the foot. My #1 boot guiding and playing in Alaska is a single layer leather boot but with Ibitherm extra layer under the foot. I have worn these boots linked below to -40 with virtually no cold feet, -20 never cold feet.
http://www.sportiva.com/products/footwear/mountain/nepal-evo-gtx
Cold feet? place feet on an insulated foam pad and feel the difference. I always carried a small closed cell foam pad just for this reason. One to sit on too.
Ensure you are well hydrated, do not try to hydrate the day before but weeks before and stay hydrated. Eat small and frequent high calorie snacks during the day. I eat M&Ms and logan bread.
Take baby aspirin or garlic pills to help thin the blood.
Try not to bend your knees when sitting.
When lacing up your boots before heading out the door, lace each boot with full body weight so the foot has some room in the boot when lacing. If your feet do not have body weight when lacing, the laced boot can restrict some blood flow and pinch the foot, blisters too. Also you can skip a lace hole over the top of the foot or keep the laces loose. There are a bunch of lacing tricks to combat foot boots issues but no way I can explain them all.
Do not wear 100% wool socks. Wool is a natural fiber and while it does insulate with damp, a 50/50 synth wool sock is warmer by the synth dispersing sweat and drying quicker. If you can find Outlast socks, nothing is as warm. Use a Superfeet insole, winter green with Outlast if you can find them.
Sweaty feet, liberally rub your feet with Degree underarm before leaving the house, cabin, tent. You can change your socks once on the stand but this subjects your feet to the cold and your boots may be already damp.