Far Infrared Onnetsu Heat Therapy combines Far Infrared (FIR), based on the newest scientific technology, and the ancient traditional Japanese concept that our unhealthy cells are cold due to the lack of energy (heat). Medically, people with low body temperature suffer from different symptoms. By applying FIR Onnetsu Heat Therapy onto these areas repeatedly, the FIR energy goes deep inside and warms up the cells, making them stronger and healthier.