Everyone's ear shape and size is unique, so finding the right earplugs can be a challenge. These SmartFit Heat-Activated Earplugs offer a unique one-size-fits-all solution. They are the only reusable earplug with Conforming Material Technology, which uses body heat to adapt to the shape of virtually any ear canal for a comfortable, personalized fit. This universal application also simplifies your inventory control, as you needn't stock multiple sizes to accommodate all employees. The three-flange design adjust easily to the ear canal for unmatched comfort and good hearing protection with a Noise Reduction Rating of 25. The detachable nylon cord allows the earplugs to adapt to virtually any work application. All SmartFit Earplugs come with the unique HearPack storage case to keep the earplugs clean and to help prevent loss or misplacement.