What I like about this is the pockets.  The left one has a buttoned compartment, a slot for a pen or similar and a non-buttoned compartment that will hold a small notebook or the like.

The large fits my 5'11 180 lb. self just fine, although a bit long in the arms (I'm a 33 in. dress shirts).  This little challenge is addressed by a second slightly tighter button available on the cuff.

This really isn't a summer weight shirt, not that it's heavy, by any means.