Peltier + fan, you can see it here: https://first-flight.sony.com/images/projects/reonpocket/image03.jpg https://first-flight.sony.com/images/projects/reonpocke

Peltier + fan, you can see it here: https://first-flight.sony.com/images/projects/reonpocket/image03.jpg https://first-flight.sony.com/images/projects/reonpocket/ima... Looks like it blows the heat away? So it's really just a spot-cooler, which would be uncool because a cold spot will fool the body in to thinking of an inflamation I think (so you'll get a stiff neck).