don't use to many big layers. your skins need to be able to breath. and if you wear to many layers your feet will start to sweat then the cool air will make it worse. a good boot with a good rating is the starting point. a good wool sock with a liner is the next step. and make sure your feet aren't cold when you put everything on. then all you will do is trap the cold air. Both Ducks unlimited and realtree have good sets of wool and liners.