Arai QuantumX and SignetX Street Helmets

The new QuantumX and SignetX are the perfect choices for almost any type of street riding, and utilize two distinct fit packages for optimum comfort and fit. The QuantumX features a Round Oval (R/O) shape for riders with an even balance between length and width. The Signet X features a Long Oval (L/O) shape for head shapes with pronounced length, but a reduced width.