Purpose-built for the street. A new benchmark in comfort, quiet, stability and ventilation. Arai applied the same tireless 24-7 focus devoted to our race helmets to designing it, refining and adapting proven concepts to a new purpose. The interior lining includes Arai's signature 5mm peel away ear pocket padding and ear pocket recess to accommodate communicator speakers. On the long, narrow end of the head shape spectrum, the Quantum series has always been the "go-to" helmet of choice. The new Quantum-X exemplifies that shape in a feature rich package.