I wish I had one of these- I don't live in Japan, but here in the States, we are reaching record breaking high temperature just as they are in Japan.
However, Japan is much more gadgety then folks here in the US, so they refuse to stay warm and have innovative ways of staying cool!
First it was the USB powered necktie that came with a fan.
However, that only cooled the neck, so in addition we have these jackets above containing two small fans sewn into the fabric and run on a pocket-sized rechargeable battery.
The air circulation evaporates sweat and keeps you cool.
So put on your jacket, cut open your square watermelon and drink an ice cold Bilk to stay cool during these hot summer months Japan style!
[air conditioned jacket]