It looks like the Nike ACG department had something cool under their sleeves. They have been recently working on really interesting and functional concept - the Convertible Considered Dunk. This Dunk features a heel flap which can be flipped down making it easy for the wearer to put on or take off. We would imagine that they would be useful for frequent flyers who could easily slip them off during security checks or on the plane. Unfortunately, Nike decided to drop this idea so you probably won't be seeing this in stores anytime soon.