Maybe you crashed and it somehow broke, maybe you simply misplaced it, or maybe you'd just like to add another light mount to a different helmet in your collection so you can transfer the lights back and forth. Whatever the reason, the Vis 360 Spare Rear Mount mounts your Vis 360 rear light (in both Plus, and standard versions) to the back of your favorite helmet by means of a simple clip backing and a hook-and-loop strap.