The head strap keeps your gopro hero camera mounted to your head without a helmet it is the same accessory that comes with the helmet hero camera and works well as a replacement or spare strap this chest harness makes it easy to capture immersive video and photo footage whether youre skiing mountain biking or any activity where you want to get a lower than the helmet view of the action the handlebar mount for gopro hero is a clamp for mounting a gopro hero action camera on a standard 31