This jacket is great. Light and it keeps you warm. I normally wear a medium on shirts and jackets. However, for this particular item, this jacket perfectly fits. When it say perfectly, I mean its loose enough but not too loose on the chest. I’m glad I lost weight otherwise I would have to opt for a large. If you’re opting to buy this, I recommend buying a size up. However, that may change the look of the jacket that you see on the website.