Doc's Ear Proplugs help control Otitis externa, (swimmers ear) is infection of the external ear from bacterial or fungi growth in the ear canal. This is caused by small drops of water that gets trapped within the canal and encourages bacteria to proliferate. As a result of frequent exposure, the skin thickens inside the ear and makes the canal narrower which can cause in eventual hearing loss. Unlike silicon earplugs or earplugs that penetrate the canal, Docís Proplugs will not irritate the ear canal or disrupt earwax production, which is natureís protection from foreign microorganisms. Proper use of Docís Proplugs prevents the flushing out of natural earwax which keeps the ear moisturized and protected. Pro Plugs are non-vented.