The front of the breath box has a large velcro area to attach to several types of helmet set ups
The breath box is soft so that it comfortably fits around your nose and mouth
A Velcro strip is included with the breath guard for mounting in helmets with a smooth surface inside the chin bar (no snap holes or slots)
This part is used in helmets with a snap hole and two slots on either side. You'll see the hole and slots on the inside of the chin bar.