Nutcase Union Jack Matte Multi-Sport Helmet, Small/Medium Expanded Polypropylene (EPP) protective inner foam for high impact and multiple impact protection Injection-molded ABS shell Anti-Pinch, Magnetic Buckle/chinstrap for one-handed operation Three sets of removable low-density polyurethane foam insert liners for comfort, and for refining fit 2 Front intake vents, 7 multiple top-mounted exhaust vents, and 2 Rear exhaust vents