All Giro helmets are designed to reduce as much energy as possible while meeting and exceeding stringent safety standards. The goal of Giro's Mips helmets is to refuce rotational forces while enhancing fit and comfort by combing the Mips slip plane with the helmet's adjustable fit system. Giro believes that helmets equipped with this technology can reduce the amount of rotational force that may be transfered to rider;s brain in certain impacts. The two piece shell combines a tough outer hard shell with a polycarbonate lower shell permanently fused to the liner for durability without excesss weight. The In Form 2 Fit System is lighter and lower profile than the original, and easier to dial in a custom fit in seconds, even with gloves on. An improved dial design provides up to 6cm of adjustment plus enhanced stability. For optimal preformance of both helmets and goggles, Giro products are designed to work together, ensuring a seamless interface between helmet and goggle for an exceptional fit and dependable, worry free function. Our stack Vent was developed based on research showing the majority of warm air that can cause fogging comes from the goggle's center top vent. Aligning the stack vent in the helmet with the center vent of the goggle helps keep it clear and fog free. The discrete exterior vent design and interior channeling combine to create optimal airflow and temperature regulation. This auto-venting technology manages airflow and temperature motion riding, hiking, or standing static. Giro Terra Mips Helmet Womens