The most portable, but potentially the least comfortable(depending on your preferences), the in ear headphone has become widely popular with the on-the-go crowd. Earphones incorporate an eartip (typically made of silicone or foam) which creates a seal with the ear canal, blocking out an incredible amount of ambient noise and yielding fantastic sonic results.
Most commonly used when exercising, playing sports or on-the-go; earphones are also widely used by musicians for monitoring purposes in professional applications. Some brands which specialize in quality earphones include Shure, Westone, Sennheiser, Etymotic Research, Klipsch and Yurbuds.
Please see our Buyer's Guide for more information on In Ear Headphones.