The ER20XS is the next generation of Etymotic's industry-leading ETYPlugs High-Fidelity Earplugs. ER20XS eartips are interchangeable, and they can also be used with foam eartips with essentially no change in response. ER20XS earplugs come with three interchangeable pairs of eartips for more fitting options. Foam eartips on ER20XS Universal Fit earplugs work in conjunction with the advanced technology in the earplug itself, offering protection and clear communication. ER20XS Universal Fit Earplugs feature a stem-less design, with a low profile that conforms to the plane of the outer ear. This makes them particularly comfortable to wear under hats and other headgear. A small, flexible pull tab allows for easy removal. Includes Earplugs with 3 pairs of eartips, case and neck cord.