Airoh Rev Flip Helmet - Revolution MattAiroh Rev Flip Helmet The innovation in Airoh modular helmet technology, has allowed to take touring to a new level of comfort and versatility. REV is a flip front thermoplastic helmet that can be worn either full or open face through the patented rotation of the protective chin guard. Equipped with a particular rotation of the chin guard and visor system that has been carefully designed and patented, REV is characterized by a special ventilation