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Hakugen Hand Warmer features the following properties:
Take 1 packet from plastic bag and place at position where warmth is desired e.g. hand, pocket
I was hoping these would keep me warm during winter in Shanghai. You can feel a little bit of heat but it's definitely not hot enough to keep your hands warm especially if the temperature is <10c. It might, however, keep you slightly warm if you can somehow attach it to your body underneath clothing.