For additional safety, a twICEme® Medical ID NFC chip is located on the back side of the helmet. Store your vital medical info and emergency contacts within the helmet so first responders can instantly get the information they need when time matters most.- FIT: The Oakley®-designed, 360° fit system incorporates an adjustable dial for a comfortable, customized fit. Overall improvements to the shell shape ensure ARO3 Endurance sits lower on the head for better balance, while fitting more naturally to the contours of your head.- PROTECTION: The Mips® safety system is designed for added safety against a variety of accidents, helping to reduce the harmful forces that might otherwise impact the wearers head.- SAFETY: a twICEme® Medical ID NFC chip is located on the back of the helmet. Store your medical info and emergency contacts within the helmet so first responders can instantly get the information they need when time matters most.- VENTILATION: Featuring added and enlarged vents, ARO3 E