S-Raw DOT Approved Motorcycle Helmet For Adult MX Racing Helmets ATV Helmet Kawasaki Helmet Motocross Helmet Dirt Bike Helmet Motocross Gear Unisex Motorcycle Off Road Helmets This is the perfect choice for those looking for a high quality and stylish motocross, off-on road, or ATV helmet at an affordable price. Light weight ABS composite shell provides a balanced combination of mechanical toughness, good dimensional stability and heat-resistant. Internal polystyrene protective liner; the special shape and construction featuring differentiated density increases mechanical resistance in the event of accidental shocks. The reliable and tested double D-ring system ensures stability, safety and resistance. Ventilation system for optimum circulation. Label Size SMALL: Suit For The Head Circumference 20.5-20.8 inches(52-53cm); MEDIUM: Suit For The Head Circumference 21.2-21.5 inches(54-55cm); LARGE: Suit For The Head Circumference 22-22.4 inches(56-57cm); XL: Suit For The Head Circumference 22.8-23.2 inches(58-59cm). 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.