Hi-Head is much more than just a hat. In fact, it incorporates removable high performance speakers that allow you to listen to your favorite music at all times. Further a hands-free function for your cellular phone is included, so you can have a conversation with your friends without getting cold and look stylish while doing it. Hi-Head is compatible with iPhone family, iPod family, a lot of mobile phones and every music source through universal jack 3.5mm. Fabric cable. Controller with microphone and shuffle button.