What if the solution inside is in contact with bare skin?
Just wash with water. It's an all natural saline solution and it smells like vinegar.
How long does the heat last
anywhere between 20-40 minutes depending insulation and direct exposure to cold air
How hot do they get?
They start at 130 degrees which is a low enough temperature to not burn you. If you have sensitive skin, they can be wraped with fabric. This actually makes the heat last longer by insulating it.
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