In-ear headphones are here to stay, and they've come a long way sin recent years. Having a great pair of headphones that don't take up too much space, but still sound great, is a perfect way to listen to music when you're on the go, excercising, or testing out your new mixes. Search through higher-end sound-isolating models like the Shure SE215 or find that perfect cheap pair for when you're out on a long jog.