The listing, Nike Headphone Hat for iPod Nano has ended.
A black Nike beanie with built-in headphones. The (working) headphones are on-the-ear speakers built into the fabric, with a short 1/4 inch audio stereo cable from the speakers to a slot on the outside meant to fit an iPod nano. (Though any other similarly sized MP3 player would fit.) Pick up a cheap stereo extension cable and you could hook this up to any any phone/MP3 player, regardless of proximity to the hat. Great for runners. I only used it a couple times myself, so it needs a more loving home.