JVC research shows that consumers' biggest problem with in-ear headphones is their tendency to fall out. The HA-FX66 headphones tackle that problem by using a soft silicon rubber air cushion for the earpiece body. The result is an in-ear headphone that stays securely in place while remaining comfortable. What's more, the design also provides superior isolation from background noise, allowing the user to get the most out of the headphone's 8.5mm neodymium driver. Noise caused by cord movement is also minimized because of the headphone's Friction Noise Reduction Cord. vibration-proof structure. The HA-FX66 includes a carrying case for easy transport.