I believe AGV holds the current record with their Pista and Sport Modular, I actually bought a sport modular tried it for a day and sent it back. Was very poorly made for an $800 helmet, plastic felt like cheap plastic used in a kids toy and the carbon fiber had flaws. It was extremely light though felt like wearing nothing. I gave up on the ultralight helmet idea and now wear a Schubert E1, a well designed helmet feels weightless at speed, the aerodynamics of the E1 are awesome without the peak installed. Not to mention it's incredibly comfortable and quiet even after hours of wear and being able to flip up at lights, traffic jams to get a drink of water or just not be stuffy in the summer is worth it.