Lewis N Clark's Pressure Reducing Ear Plugs offer the safest, most reliable solution to ear pain by slowing the movement of air into and out of the outer ear, giving your inner ear more time to adjust to the changes in air pressure often experienced during flight. With a noise reduction rating of 22db when used as directed, background noise is reduced, but speech is not filtered out. These reusable (up to five flights) ear plugs remain comfortably in place and can be used for mountain driving. Not suitable for children under the age of 12.