I've been wearing this jacket in Albuquerque, NM. The coldest temperature I've worn this jacket in so far has been roughly 10F with some significant wind. This jacket has kept me plenty warm with out any additional outerwear. It's very comfortable and is not very bulky or heavy. My only suggestion for improvement is for the hood to be lined with softer/slightly warmer material. Has several useful pockets and I have even used the inner cargo net to carry my 10" tablet around. The arm pit zippers are awesome for a sweaty person like myself too.