FIR therapy Tourmaline Dome Far-infrared rays (FIR) are waves of energy. Totally invisible to the naked eye, these gently elevate the body’s surface temperature to 42°C (107.6 °F) and above. This treatment activates body systems and functions. “Palm healing,”an ancient tradition in China, has used the healing properties of far-infrared rays for 3,000 years. [...]