The GameChanger sets new standards. What is a cyclist's biggest enemy? Air resistance. Every cyclist knows that battling against the wind is one of the toughest challenges they face. With its Multi Position Design, the GameChanger redefines aerodynamics. The special shape reduces air resistance by minimizing exposed surfaces regardless of weather conditions, head-tilt position, and inflow angle. Our innovative Forced Air Cooling Technology sucks in incoming air and channels airflow around the head, creating a perfect climate and keeping your head cool, even in hot races. - Multi Position Design: For optimal aerodynamics regardless of head tilt - Forced Air Cooling Technology: Sophisticated ventilation system for an optimal head climate - FlowStraps: Aerodynamic, flutter-free, and skin-friendly thanks to specially developed strap profile - Zoom Ace: Finely adjustable adjustment system with handy adjustment wheel for customizable fit - AirPort: Aerodynamic glasses holder with strap guide - Multi Shell In Mold: For safe shock absorption - Ponytail compatibility: Helmet well suited to plait wearers Sizing: - Small: 51 - 55cm - Medium: 52 - 58cm - Large: 59 - 62cm