3M E-A-R Classic uncorded earplugs set the standard in hearing protection as the worlds first foam earplugs. Constructed from slow-recovery foam, the disposable earplug conforms to the shape of the ear canal for premium hearing protection. 3M E-A-R Classic uncorded earplug is a reliable choice in hearing protection and conservation. The slow recovery foam used to create these earplugs provides a flame resistant, moisture resistant and sound resistant barrier for the ear canal, making the 3M E-A-R Classic uncorded earplugs are one of the most widely used foam earplugs today.