Base polypro layer, Cabela's ECWCS (Extreme Cold Weather Series) thermals, bibs, and jacket with hood. For really cold sits, I've sewn pockets on the ECWCS on the back near kidneys for handwarmers. Works GREAT! (Too great if you don't keep 2 layers between the handwarmer & skin...you get 1st degree burns!). My feet used to get cold wearing traditional 800gm Thinsulate leather hunting boots (purchased for walking hunts), but then I switched to 800gm rubber boots with a carpet sample under my feet in treestand. I'll sit for 4-5 hours in Michigan winters no problem with that setup.
