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We have those in the USA. They are called cars. They are incredibly popular.

This isn't just a pedantic joke. My point is there will be little demand for such a thing in the USA, since the USA, unlike much of the world, supports a culture in which it is, for better or worse, already easy to avoid going outside for more than a couple of minutes at a time.

Heated clothing might make sense. But for cooling unless we are talking about something evaporative or absorbing there just isn't feasible technology. There is Peltier effect, but that is horribly inefficient and cooling the hot side is bit of a pain...

Something like the Sony Reon Pocket? https://www.sony.com.hk/reonpocket/en/

Thank you. I will take a further look at it.

It seems to be a tiny battery operated, small fan cooled peltier device. Don't expect much from it.

In fact, it might work better if you remove the peltier device and battery and just direct the fan to blow across the nape of your neck.