Sweaty feet is my problem and here it can get pretty cool come late fall/early winter. First layer is always polypro wicking sock linear, 2 second layer is a wool sock of approriate weight, 3rd is the boot & 4th if need be is get your feet off the frozen gound, floor or stand. I wear an entirely different boot for sitting then walking, my choice is Schnee Pac boots for sitting. They fit me very loose, lots of wiggle room. I never wear these boots or my socks into the sitting spot. When walking into the spot i dress as little as possible to limit sweat up and then layer up as needed. Polypro. undergarments are all I will use when its cool to cold, followed by layers of fleece or wool. A wind proof layer. Raven wear garments are excellent for sitting on cold days. Don't leave out the headwear, lose a lot heat through our heads. Handwarmers can be popped in your boots as well your mitts. Make time to stretch and get the blood flowing, arm circles, jumpjacks, etc all work. Eat and drink properly, as much as I love coffee, caffine is a killer in cold I avoid chocolate, pop, coffee, tea, etc when hunting. Cup of soup or even broth is a great warm drink sub with some nurishment value as well. Small sips of water are my main stay, stay hydrated but minimize the need to void (pee). Food; A good breaky, snack or lunch with carbs such as granola, cereal bars, PBJ sandwiches, etc.

Heater body suits, sleeping bags, etc can be used as well or in addition to layer with good garments.