POC's new Cerebel helmet is a short-tailed lid much like the Kask Bambino. It offers little in the way of venting, but its clever magnetic visor makes it easy to don and remove, and its small size is meant to make it useful for a wider variety of head positions. Personally, I'm very keen to test one.

The Scott Split is an all-out aero helmet, with very little venting and very little compromise. It's meant for speed, pure and simple.

The red helmet in this series is the Bambino Pro, distinct from its predecessor the Bambino in three important ways: its visor features a more advanced magnetic docking system, it uses a traditional ratcheting adjustment mechanism, and it will have mirrored lenses. I'm very much hoping to review one soon.

Smith claims the Overtake tests nearly as fast as the Specialized Evade, widely-touted as a top aero road lid.

The Star Pro is Bell's take on an aero road helmet, much like sister company Giro's Air Attack. The Star Pro's integrated visor latches with a slot-based magnet, rather than the three-pointed magnet system of the Air Attack. Very nice indeed.