The Classic Certified Helmet features Pro-Tec's most durable outer high impact absorbing ABS shell, 11 open vents and an EPS foam liner with compression moulded padding. Shell: Durable and tough, Injection moulded ABS (acrylonitrile butadiene styrene). Liner: High impact absorbing EPS foam (expanded polystyrene). Vents: 11 open holes for ventilation. Interior: Compression moulded padding. Nylon webbing strap with buckle. Certification: CE EN 1078 European Saftey Standard.