I hunt in Northern Minnesota near Embarrass which is one of the coldest spots in the US. For November deer season, I walk in with just sweats and a sweatshirt which I then take off and put on the polyprop underwear and then the Fleece as a midlayer and Browning hydrofleece jacket. I' ve found that fleece is so warm for me that I have to take it off if I' m walking to or from the stand or I get way too overheated. Can' t go wrong with wool either...