XP Defender Ear Plugs offer you the most innovative ear plug solution yet. These ear plugs are easy to use. Simply place them in your ears and choose the mode that you prefer. When loud noises hit your ears, Dynamic Mesh filtering System(tm), will automatically filter out those sounds protecting your hearing. Then, close the valve to get total hearing protection. They are portable, small and easy to carry around, so that you can always have hearing protection without blocking out all of your hearing.