Giro 540 Helmet: The Giro 540 Helmet is a high-performance helmet in a low-profile style. Trim design and injection-molded shell make the Giro 540 Helmet lightweight for all-day comfort while twelve vents keep you cool on warm spring days and long backcountry hikes. Giro’s goggle notch accommodates your goggle strap and prevents gaps or slippage while fleece ear pads keep snow and wind out.