Infrared winter insole (HSP-5,anpan) keep your feet warmth even ... /UL Newest product Infrared heating insole,heated insoles(HSP-5,anpan) Heated shoe Insole - soft, comfortable heating ... a temperature just below that of body temperature, approx. 98 degrees Fahrenheit or 36 ~ 37 degree Celsius. Heated ... maintain a temperature of an approximate body heat of 98 degrees Fahrenheit or 36 ~ 37 degree Celsius, ...