The HA-FXC50 provides excellent sound and superior sound isolation by employing an innovative MICRO-HD driver unit, loaded into the tip of the earphone housing. Different from conventional in-ear earphones, this allows the driver unit to stay in the ear canal, delivering high-definition sound directly into the ear without diffused reflection. The silicon earpieces are both comfortable and practical, fitting securely in the ear while minimizing sound leakage at the same time. The earpieces come in three sizes to ensure a customized fit, and the earphone come with soft rubber cushions designed for hours of comfort for any wearer.