Relieves scratches in the ears: the mask hook is compatible with most market headphones and reduces scratches in the ears. It can be replaced in seconds and relieves the ears of pressure and fatigue. For thin face: if your face is too thin to use an adequate mask, this can help you adjust the mask and provide better protection. For large faces : The mask hook is also suitable for large faces. If you cannot find an adequate mask that feels too tight, you can extend the mask strap with an extension strap.