The walk in distance and terrain type can really make tree stand hunting a challenge in cold weather. Also length of sit. I plan to purchase some high end clothes. I need more wind stopper items. I have a lot of good wool, some top quality long underwear. I've been putting under armor next to the skin.
I have to backpack my sitting clothes in in the morning or get too sweaty. Latley on all day sits, the only thing that keeps me in the stand on cold days is a bunch of hand warmers place all over my body. I use hand warmers in my shirt at my armpits, biceps, wrists, chest, kidneys, in my socks above my boots, under my hat and last year I started putting a few in the nether regions. But watch out, they can get really hot! I sometime use 12 of them. It seems expensive, but would you pay $15 to warm up?