SMK Stellar Dynamo Helmet - Matte Black / White / GreySMK's Stellar helmet is an aggressively styled helmet designed for the fashion conscious motorcycle rider. Two shell sizes (XS M and L 2XL) allow for a precise fit no matter your head size. A multi density EPS liner and EIRT (Energy Impact Resistant Thermoplastic) shell provides great protection when required. The aerodynamic shape of the helmet reduces stress on your neck, allowing for a more comfortable ride. The Stellar includes a breathable