Shure today has begun shipping its , which combine the "studio quality sound that listeners have come to expect from the E Series with a sleek, lightweight design to complement today's popular listening devices." The E4c earphones further are optimized by leveraging Shure's new High-Definition driver with Tuned-Port technology to significantly enhance bass response. They also feature sound isolating sleeves, which contour to the inner-ear to natural seal out more background noise. Weighing just over an ounce, they also feature a small, portable, attractive design. The E4c earphones ($300) include a pair of disposable foam sleeves and triple-flange sleeves, three sizes of flex sleeves, and three sizes of ultra-soft flex sleeves as well as offer a 2-year warranty.