I am 5' 8 1/2. shorter arms. 173 lbs. ...
I am 5' 8 1/2. shorter arms. 173 lbs. 31-32 waist. muscular shoulders. should I get medium or small?
What's up there Bruno. For comfort's sake, I would say Medium will fit you better. It won't be tight across the shoulder blades and offer you freedom of movement that the small might not have.