This noise-isolating ear-canal phone delivers an outstanding, bass-driven stereo sound. An optimal and secure fit in the ear-canals is assured with the inclusion of a set of ear adapters (S/M/L sizes). Sport II CX 380 stereo earphone also ensures a high attenuation of ambient noise, letting you enjoy your music during your workout. The earphone sweat and water-resistant construction also makes them ideal for use when engaged in sporting activities.