For those who don’t know what a Henley is, a Henley is a pullover shirt. It is somewhere in between a polo shirt and a regular t- shirt. In the sense, that a Henley does not have a collar like a tee but has a round neckline with a placket with somewhere between two to six buttons. The sleeves are either full or short. I really like the Henley in long sleeves.
Now coming to the why. Not that you really need a reason. I mean, it fit quite snugly, keeps you warm and looks really hot.