Far-red hot pack warms your bodys core and improves blood circulation. Use in areas with stiffness and pain. Recommended for those with stiff shoulders, stress, nerve pain, muscle soreness, and foot fatigue. This far-red hot pack is not only recommended for use in wet air oil as well as relieving pains that become difficult when it gets cold. It has a good structure to warm up the burlap oil. Far-Red Hot Pack Features: -Safety design with overheating prevention device, built-in automatic temperature regulator, and a waterproof type safety design. ■ Can be used with hot damp cloth. 　Simply place a damp towel (fabric) in the desired location and place the far-red hot pack on top of it to use it as a quick wet cloth. - Far infrared generation: Far red hot pack with ceramic sheet contains far-infrared ceramic sheet. 　 Far infrared is a long wavelength among infrared rays, and it has been found that the human body absorbs heat well.Far infrared rays keep you warm from your core (Easy to use warm damp cloth) When used in combination with Biwanileaf extract or ginger water extract, you will feel good when you use it. Recommended for use with heat oil dampeners.