Giro Ratio men's helmet * certified helmet meets European safety standards CE EN1077 * Hard Shell construction - highly resistant shell * In Form Fit System (adjustable wheel in the back) - makes it easy to dial in your own fit in a few seconds. Ergo-frinedly provides adjustment and better stability * adjustable ventilation with control, allows instant adjustment of airflow with one control button * STACK VENT™ TECHNOLOGY – discreet design of external vent and internal routing * compatible with Giro goggles * compatible with Aftermarket audio systems from Giro Outdoor Tech * vertical tuning: adapts to different glasses and head shapes for a custom fit without a gap * ear padding suitable for storing audio headphones * back loop for attaching glasses * weight for size M is 590 g * size M (55.5-59 cm), L (59-62.5 cm), XL (62.5-65 cm) * Giro ski helmets * Giro snowboard helmets * helmet, branded helmet