The Avera 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, and features the personalized fit via the In Form™ Fit System with Vertical Tuning. Meanwhile, on-the-go temperature control for maximum warmth or cooling is achieved through Thermostat Control™ 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. MIPS - Multi-Directional Impact Protection System, In-Mold construction, In Form Fit System, Thermostat Control adjustable venting, Seamless Compatibility with all Giro goggles. Available sizes: Small (52-55.5cm), Medium (55.5 - 59cm), Large (59-62.5cm), Extra Large (62.5-65cm).