Japan has been using chemical hand warmers for decades; they are extremely common in use and are sold almost everywhere during the winter season.
These disposable pouches of self-generating heat are referred to as ‘kairo’ and can bought at any convenience store or pharmacy for quite cheap.
Businesses in Osaka have a habit of keeping their customers toasty warm, which can mean experiencing extreme temperature differences as you transfer from the street into various indoor environments. Foreigners to the region often find such large temperature swings uncomfortable.
Using hand warmers to quickly apply or remove heat may be a good idea if you find yourself constantly over and under heated as you travel throughout the city.
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