The oxford metro v helmet is a comfortable fully protected helmet that features an integrated led light on the rear to help increase your visibility to anyone behind you the helmet itself has been designed around a light weight micro shell with 19 air vents and a dual fit retention system for a comfortable well ventilated fit for all riders the led light runs on a single cr 2032 replaceable battery oxford metro v helmet features 19 air vents integrated sun visor light weight micro sh