The Toastie is a Peruvian-style unisex acrylic beanie with a mock lamb"s wool lining that will be sure to keep your head warm. An AERIAL7 embroidered logo covers each ear flap with pom-pom accents on the top of the beanie and is available in white and black. The best part of this chic beanie is the ultra slim sound disks that slip into the fleece lining keeps you rocking all day long. 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. 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