S-Raw DOT Approved German Motorcycle Half Helmet Adult Harley Motorcycle Helmet Lightweight Street Bike Cruiser Scooter Snowmobile ATV Helmet Slim Line Summer Motorcycle Helmet Meets DOT Safety Standards. Vintage WWII German Style Half Helmet with Sleek Design. Lightweight & Durable ABS Composite Material Shell. Helmet Liner is Lightweight, Soft and Easily Washable, Well Vented All Purpose Product for Four Seasons Especially Summer Riding. Please measure your head size before making a purchase. The circumference of the head should be measured at a point approximately one inch above the eyebrows, or at whatever point gives the largest possible measurement. Label Size SMALL: Suit For The Head Circumference 21.2-21.5 inches(55-56cm); MEDIUM: Suit For The Head Circumference 22-22.8 inches(57-58cm); LARGE: Suit For The Head Circumference 23.2-23.5 inches(59-60cm); XL: Suit For The Head Circumference 24-24.4 inches(61-62cm).