Giro Avera MIPS Helmet - Women's: The Avera(TM) MIPS helmet is the new foundation in the Giro helmet line and a new favorite. The Avera MIPS benefits from a lightweight in-mold construction (with optional MIPS), and features the personalized fit via the In Form(TM) Fit System with Vertical Tuning. Meanwhile, on-the-go temperature control for maximum warmth or cooling is achieved through Thermostat Control(TM) Adjustable Venting combined with the fog-free Stack Vent. The new Avera MIPS truly provides the perfect fit, plush comfort and added protection needed for all conditions and terrain. CONSTRUCTION MIPSA(R) - Multi-Directional Impact Protection System (optional) In-Mold construction FIT SYSTEM In Form(TM) Fit System Vertical Tuning VENTILATION Thermostat Control(TM) adjustable venting Stack Vent FEATURES Women's Series Compatible with aftermarket Giro audio systems by Outdoor Tech Seamless Compatibility with all Giro goggles Compliance: CE EN1077 SIZES S: 52-55.5cm M: 55.5-59cm