The Smartfit Corded Earplug is made of conforming material technology™ : Thermoplastic Elastomer (TPE) adapts plug to the contours of the ear canal for a more personalized fit, feels better the longer you wear it. Flat fin seal: Creates better seal, more comfortable inside the ear canal. Flanged handle: For easy handling. Detachable cord: Allowed for corded or uncorded wear choice. Hearpack storage case. Benefit: Ears are like people — each one unique and different. That’s what makes SmartFit such a marvel of user-friendly design. The only multiple-use earplug with Conforming Material Technology™ SmartFit uses body heat to adapt to the shape of the ear canal for a comfortable, personalized fit. With an a detachable cord system and HearPack packaging, it’s the ultra-smart choice for today’s diverse workplace.