Thermotex Far Infrared Heating Pad - Foot.Delivering a large footprint of safe and effective far infrared heat and boasting an easy to clean cover, allowing for the treatment of both feet at one time. The Foot System utilizes a single patented insert.After just 20 minutes of use, the soothing infrared wavelengths penetrate up to 2.36 inches into the applied area. This results in an increase in blood flow, which provides nutrients, oxygen and proteins to the area to relieve pain and inflammation. These enhanced natural properties are what the body requires to heal.