Enjoy listening to foot-tapping music wearing the Sony’s comfortable fit stereo sports earphones. Equipped with 13.5 mm high-sensitivity driver units, our MDR-AS210 sports headphones are no different while also affording a secure, comfortable fit that lets you get close and personal with your workout. Comfortable and secure, the unique ear loop is easy to use while affording a comfortable and secure fit. Simply slide over the ear and slide into position. Water resistant, the water resistant housing prevents sweat and water from leaking in, making these headphones ideal for an active lifestyle.