Here's the best recent article I've found on Time Trial helmets,
not that I'm likely to be wearing one of these puppies anytime soon!
I am in fact wearing a Bell Paradox model off the shelf.

Article has some interesting pix, Click here:
Those of you who watched the prologue time trial may have been wondering why some teams were using standard road helmets and others using aero' helmets.
more..

PoC