Sony is crowdfunding a personal air conditioner that you can wear under your clothes! It's called the Reon Pocket, and it slips into a pouch in a special t-shirt. It then cools you off by sitting on the base of your neck. It's controlled by a mobile app and is said to get a full 24 hours on 1 charge.
It's not available yet, and will only come out in Japan at first. Hopefully, though, it makes it to the states soon. How convenient would this be to have on if you work on your feet? Or just go on vacation to someplace super warm.
CHeck it out below. Also, get the full run down here: Engadget.com