AHR RUN-C Half Face Helmet boosts retro German style with sharp-looking jet black finish for a classic yet trendy look Adjustable chin strap with quick release buckle for easily securing or loosening Meets DOT FMVSS-218 with impact-resistant hard shell and high-density foam layer offering excellent protection to head Features lightweight ABS shell for less neck fatigue, fully ventilated EPS liner for absorbing impact while avoiding sultriness Please measure your head's circumference before purchase