Custom hearing aids are uniquely moulded to perfectly fit each of your ears. This allows for incredibly easy handling, insertion and removal, and for the most subtle style available. There are several types of custom devices that vary in size depending on whether cosmetics or manageability is more important. The latest Invisible-in-the-Canal (IIC) hearing devices are popular among those who desire hearing help that can't be seen. This style is suitable for mild to severe hearing loss.