I'm 5'8", and I bought the medium originally, and then immediately exchanged it for a large once I tried it on. Both fit well, but the Large offered me more back protection, so that was the obvious choice. This back protector is super light, and offers a great deal of breathability. It's been getting pretty warm lately, and I haven't been uncomfortable, or overheated yet. It offers a pretty good range of forward motion, so you are not restricted when buckling your boots or strapping on your bindings. The closure system is great and has a pretty wide adjustment range to dial in a great fit. There is a wide elastic and velcro closure system for the waist, and the backpack style shoulder straps, work really well too. It doesn't offer any neck protection, but only the POC one does. It does offer pretty good coverage throughout the rest of the back though. One of my favorite things about it is how comfortable it really is. | 
