If you are looking a casual, lightweight blazer then I recommend this. It looks nice, and it is pretty comfortable. The material is about two t-shirts thick. So, the jacket itself isn't too heavy. I am 170 pounds and purchased a medium. The build is around the same as my other slim-fit, medium jackets. The arm length, blazer length, and shoulders are right on. If you want something that fits tighter in the chest, then I suggest going a size down. If so, beware the arm length will be most likely too short. That'll look a little weird, right? Durabilty wise, I'll speak later on that behalf.

Try it. If you don't like it, send it back. Simple as that, cat!