Giro Era MIPS Women's Snow Helmet Construction - in-mold construction, MIPS Fit system - in form fit system, vertical tuning Ventilation - thermostat control adjustable venting Compliance - CE EN1077 Features - designed specifically for women, women's design ear pad detailing, compatible with aftermarket Giro audio systems, seamless compatibility with all Giro goggles MIPS  Multi-directional Impact Protection System In-Mold Construction In Form Fit System Vertical Tuning Thermostat Control Adjustable Venting Super Cool Vents Designed Specifically For Women with Custom Earpads &amp; Trim Detailing Compatible With Aftermarket Giro Audio Systems by Outdoor Tech Seamless Compatibility With All Giro Goggles Compliance: CE EN1077 S (5255.5cm),M (55.5-59cm)