Designed for discerning ears that crave for satisfying bass with extraordinary detail, Vortex reference in-ear headphones feature Moshi Audio"s proprietary RigidBody driver housing aimed to deliver fast articulate bass without distortion. The drive units consist of high-definition Neodymium drivers housed in sintered steel alloy which minimize cavity-induced coloration. This design not only vastly improves low frequency extension, but also renders silky smooth highs. To obtain meaningful bass from any in-ear headphones, a tight seal between the ear tip and your ear canal must be achieved and maintained. Most in-ear headphones’ cables are much heavier than the individual driver unit, this constant weight-drag causes the drivers to fall out of your ears’ secure sealed position after awhile. Vortex’s lighter cable/heavier driver weight distribution enables the drivers to fit securely in your ears even when the cable is fully extended. To further ensure a secure yet comfortable fit, Vortex comes with 3 different sizes of hybrid-injection silicone ear tips as well as a set of memory-foam ear tips for optimal listening experience. It is also equipped with an iPhone compatible microphone for answering calls on the fly while listening to your favorite tunes.