The Perisher is a unisex, ultra-stretchy tight woven beanie. This is the perfect choice for those who like a modern look. From the streets to the mountains, the AERIAL7 Sound Disk Beanie merges technology and fashion. Adjustable speakers allow the flexibility to change their placement based on your activity. Slide the disk over your ears to fully engage or position the disk partially behind your ears to be aware of your surroundings. The Perisher is made of soft acrylic fabric and comes in four colors: Black, Grey, Red, and Aqua Marine. Features Engineered to deliver the highest-quality listening experience from your mp3 player or other music device. Built-in microphone for use with iPhone, BlackBerry, and other mobile devices. The Sound Disk is only 8.5mm thick and delivers a full spectrum sound experience. Driver Diameter: 35mm Impedance: 32O Frequency Response: 20-20KHz Sensitivity (S.P.L.): 1003dB (at 1KHz) Input Plug Diameter: 3.5mm Adapters: 3.5mm 3.5mm iPhone