If you have to cover your dome, and let’s face it, you should, then the 9MM by HIGHWAY 21 is a great way to do just that. Classic helmet design combined with premium material for a helmet that will protect your head, neck, and keep Johnny Law at bay. D.O.T. approved Durable lightweight ABS shell EPS (Expanded polystyrene) interior Diamond stitched Coolmax® liner Washable and replaceable interior Dual D-ring chinstrap Protective helmet bag D.O.T.