The Rossgnol HERO 9 FIS helmet is designed for maximum comfort and protection while conforming to FIS regulations. New IMPACTS technology with EPP multi-impact foam provides enhanced durability and retains protective shock absorption properties longer with no compromise to comfort or aesthetics. Hard Shell ABS technology offers enhanced durability while Air Flow ventilation allows constant air circulation for increased comfort and temperature regulation. The reduced volume and compact design controls weight and fits closer to the head for aerodynamic racing performance.
I want to know please what i need to do to measure her head size to buy the helmet pleaseAsked bells hunter from Edinburgh