I was comfortable in just a base layer and the coat with temperatures in the teens for an extended amount of time (camping). It could have been much colder and I would have still been fine. I am 6 feet tall and 215 lbs and the XL is a little big for me. I probably should have purchased the L. Other than that, I love the jacket.
This review was written in the old system and had content requirements that are different than reviews written today.