A women specific version of Giro's super popular Nine helmet, the Era snow helmet strikes an impressive balance between features and price so you can enjoy all mountain, all terrain action without breaking the bank. In mold construction fuses a tough polycarbonate outer shell with an impact absorbing foam liner for a lighter, cooler helmet. In Form fit system enhances helmet stability and features a glove friendly dial at the base of the helmet that provides up to 6 cm of adjustment. Vertical Tuning dials in how the helmet sits on your head to ensure a perfect fit while eliminating gaper gap and creating a seamless lockup with Giro goggles. Super Cool vents pull cool, fresh air in while pushing hot, stale air out optimal vent shaping and maximized efficiency help regulate your core temperature to keep you comfortable all day. Thermostat Control ventilation lets you customize airflow with a simple, low profile control button on the outside of the helmet. Stack Ventilation lines up with the vents in your goggles to help keep them clear and fog free while maintaining total helmet goggle integration. Womens design ear pad detailing adds a touch of feminine flair. Compatible with all after market Giro audio systems. Certifications: ASTM F2040 11, CE EN 1077. Sizing: Small, 52 55.5 cmMedium, 55.5 59 cm.