Aero helmet cover?

[winjim]

I'm watching the circuit racing on the tele and some of the riders appear to be wearing a regular vented road helmet with a clear rigid plastic cover over it. Is this for aerodynamic benefit, and if so why don't they just wear a proper aero helmet?

 

[Citius]

The cover gives them a choice, I guess..

 

[winjim]

Now I think about it, it's a really simple, good idea if it works, I've just never seen it before.

 

[DCLane]

You can buy clear covers (and coloured ones) for Lazer helmets that look like this:

 

[winjim]

You can buy clear covers (and coloured ones) for Lazer helmets that look like this:

I think that's the very thing, they were Lazer helmets.

 

[Cuchilo]

Why don't they just wear the cover ?