» The unique feature of the Perfect fit Corded Earplug is that the plug is moulded into the cord. » The material used for manufacturing the earplugs is Thermo Plastic elastomers and is of such a nature that it will not irritate the epithelium of the external ear canal, and minimize itching of the ear canal. » Comfortable for long term use. The band is non toxic, non irritating, durable and cleans with soap water.