Battery Operated Moon

I'm looking for some type of neck-cooling device I saw a while back on one of those late night commercials. I did a google search on this, I typed: "neck cooler" but, all I got was a whole bunch of tie/scarf type neck coolers but, that's not what I'm looking for. This particular item doesn't seem to be advertised as much anymore, as far as I remember it was a thick, half-moon (boomerang) shaped thing you put on the back of your neck that supposedly cools you down on hot days. Is not made of cloth or anything like that...it's a battery-operated device that you strap on your neck....based on the commercial, it cools down blood flow to your head thereby making you feel cool and refresh on hot days. Never did catch the website for this particular gadget. If you think or know what I'm talking about, please post a good answer linking me to that site. Thank You!!