Completely-in-the-canal (CIC) hearing aids are very small hearing aids that fit quite deeply in the ear. They are not invisible, but are hard to see. CIC hearing aids also give a very natural sound and work well with the phone and over-the-ear headphones. They are comfortable and easy to wear. People who wear CIC hearing aids often say that the naturalness of the sound helps them filter out background noise better compared to other hearing aid models.