Not quite available in the US, but priced in dollars from a canadian shop: http://www.swissnorth.com/STUBAI%20Helmets.html
An extra-light helmet thanks to the use of Polycarbonate and In-Mould technology. Its ergonomic side and neck cut means you could almost forget you are wearing it. The Flow Plus has an adjustable chin-strap, and a simple adjuster wheel for a perfect fit. With good ventilation and a headlamp holder, it is equally useful in the heat of the day or the dark of the night.