The CIC is the smallest hearing instrument available. Nearly invisible inside the ear, the CIC is suitable for most hearing losses and has been shown to be a superior instrument for hearing well in background noise, physical retention (BTEs and RICs can fall off and become lost), and avoiding wind noise and water damage (the microphone of the BTE and RIC style hearing aids are exposed to the wind and rain, while CIC microphones are protected by the structure of the ear).
Because the CIC fits inside the ear canal, the outer structure of the ear remains open, allowing it to work the way nature intended. The outer ear is designed to gather and focus sound waves, enhance speech-reception frequencies and provide “delay cues” to the brain, all of which helps you hear in background noise. Hearing aids that fill most or even part of your outer ear can interfere with the important sound localization process.