Just got this shell two weeks ago and took it out for a week in Colorado and it was perfect. I only had to put a mid-weight fleece under it and was plenty warm in the 20 degree days, and it breathed great on the warmer days. The blowing snow one day was no match for the gore-tex pro shell. I'm 5'10" 150 and the medium fits perfectly. I couldn't ask for a better year round jacket. Can't wait to use it backpacking this summer too.