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