How fun would this be for a teen gift!? Tanga has the Wireless Bluetooth Beanie Hat with Built-in Headphones for only $11.99 Shipped! This has a built-in mic and headphones, place and receive calls without having to hold a cold phone to your face, or just play your music wirelessly. Made from a warm and soft knit material, the headphone and rechargeable battery pack can be removed so that you can wash the cap.  There are a ton of different colors to choose from too.