first thing you have to do is to make sure you stay dry i usually put on a light first layer (cool max or silk is good ) then i put on fleece long johns ( wool is also good ) i put on two pair if it is really cold good gloves and a Balaclava or some kind of face mask you do not want much if any skin exposed and i agree with catfish for your feet then your hunting clothes ( this is for stand hunting not still hunting ) i usually put on the last layers when i get to my stand so i dont sweat on the way up
i just bought these this year a little expensive but the best i used so far i have never been so warm in negetive 0 weather
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