Oxford Lid Locker Helmet BagThis unique product finally answers the question: how to leave your helmet with your bike without it getting wet, damaged or stolen? With the Oxford Lid Locker the helmet remains completely protected from the elements at all times. The lock (not provided) is threaded down a waterproof tube which runs through the visor aperture and out of the bottom of the helmet so that you can lock it to the bike. The easiest lock to use is an armoured cable lock