The helmets that USPS are using at the Tour
are Giro Prototypes of a new helmet. Look for Pneumo's
to drop in price quickly once this is released.
Here is what Giro says about the helmet:
It's lighter than the Pneumo. The first goal with the new design was to reduce weight as much as possible, and currently the helmets at the Tour are about 15- to 20-percent lighter than a comparable Pneumo.
We're engineering a radical new carbon fiber reinforcement system, which is visible at certain points around the helmet (front, top ribs).
We've also designed a new strapping system, which eliminates the external "strap bones" that you've see on earlier helmets.
It features a Wind Tunnel ventilation design (26 vents), a multi-piece In-molded shell and a Roc Loc 4 fit system (just like the Pneumo).
It does not have a visor. It was eliminated to save weight.
The model is ATMOS
and you can read more about it here:
Velonews
Marty