The Helmet Velcro Mount has a rounded top, to allow you to mount your cycle light unit on top of your helmet. The Helmet Velcro Mount has velcro straps, to easily attach it to a vented helmet.
If your light has a XP Quick Release Clamp, you will need to remove the clamp and fit the O-Ring Mounting Bracket. You will also need an O-Ring, or an Adjustable Rubber Strap to mount your light to the bracket.
I would like to buy this, but it seems like it is mostly for a certain light. Which one?
You will be able to fit any light that mounts with an o-ring, as the shape is designed to hold the half moon bracket attached to the light and for the o-ring to pass through the mount, securing it.