I'm sure all of you Batman fans out there remember the famous Bat-suit dawned by Michael Keaton in Batman 89. As we all know, the suits cowl was without any sort of joint in the neck area. This meant no turning of the head. This costume design led to the now famous "Bat-Turn." Oddly enough, the costume designers decided to keep to this design and let the actor suffer. (Whatever looks good, right?)
Eventually Christopher Nolan got control of the Batman character. In Batman Begins, Bale wore, once again, a clunky, heavy, no neck turn cowl. But in the sequel, both Nolan and Bale (I'm sure) wanted to come up with a way to turn your head while in the Cowl. This led to the "biker helmet" Cowl. Not the same for looks as the others, but functional. (Function>Fashion, Right?)
With the released photo of Snyder's Batman, we're all left wondering if Batfleck will be moving his head or going back to the Bat-Turn.
Well it looks like we got lucky, as word is that Affleck will have full motion while donning the Cowl. If you look on the inside of the display Cowl, you can plainly see a joint in the neck area. My guess would be that they separated the cowl to start with and then sandwiched it all together with latex.
Here's the Cowl and Cape at Comic-Con. See that crease going around the neck area? It looks like we can stop wondering as to whether or not this Batman will have mobility issues. Though the jury is still out on Affleck for [Batman v. Superman: Dawn of Justice](movie:711870). (I'm sure he'll do great.)