There is a hook in the recess for the tool kit, it looks like two overlapping triangles. One end/loop of the cable hooks onto it, the cable is fed through the metal buckle of your chin strap, and then the other end/loop of the cable reattaches to that hook. This leaves your helmet hanging on the side of the bike - rest the neck roll against the paint to prevent damage. When you lock the seat back into place the whole thing is considered "secure."