Used once From Healthy Line You can use it comfortably on the floor, in bed, on a sofa, in a recliner, or even propped up against the wall. Sleep on the mat overnight to extend the time you spend bolstering your wellness. Just turn up the heat and relax as the stones release high levels of far infrared and negative ions. These natural therapies will help elevate your wellness levels to temporarily boost your circulatory system. Use the intuitive controls to find the temperature to the degree at which you are the most comfortable. Begin the journey to better wellness with a model that continues to prove itself time and time again. WHAT'S INSIDE THIS MAT? All Layers Non-Toxic External Casing Natural Gemstones Functional Layers Thermal Foil Insulation 1st Heated Wiring System Thermal Foil Insulation 2nd Pressed Cotton Layer Base Waterproof Layer