My formula for cold weather is; thin appropriate layers (wool or fleece are dynamite), some sort of wind stopper garmet (I have fleece with windstopper built in at is perfect for all types of weather). Polypropelene under garments and socks are a must. Keep the head, feet and hands warm. I wear fleece hats with ear flaps, really cold I have fur lined hats I wear, wool cuttoff gloves/mitts and wool thin gloves (i take several pair of change out hand wear in my day pack), polyproplene socks liners and good quality wool socks with thinsulate/gortex boots. I also use hot hand hand warmers, for in my glove, hat or boots. If sitting walk to the stand in light garments and then suit up. Also don' t forget food and water. I like PB Sandies, Granola or cereal bars, stuff that sticks to the ribs and helps produce heat. I only drink water when hunting, produces no odour and less void. Avoid coffee or tea as caffine will make you void and that causes loss of body heat. If you need warm food/drink, chicken noodle soup is your best bet.