HEAT CHARGER® is not sufficiently warm.

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Since heat generation of HEAT CHARGER® is affected by 1) high or low ambient temperature, 2) thermal properties of the clothes being put on, 3) individual differences in age and physical condition of the user, 4) amount of incorporating air, and other factors, uniform temperature is not always provided. Taking a HEAT CHARGER® in and out of a pocket causes a loss of warmth. In addition, HEAT CHARGER® placed between clothes without ventilation generates insufficient heat.  

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