Our space blanket, also known as a mylar blanket (for first aid, safety, thermal, or weather blanket), is a light, airy blanket made from heat-reflecting plastic. The thin sheet of plastic is coated with a metallic reflector known as a metalized polyethylene, which reflects ups to 97% of radiated heat. The design of the space blanket helps reduce the loss of heat in a person?s body due to thermal radiation, evaporation, or convection. the blanket was first developed by NASA?s Marshall Space Flight Center in 1964. Great for maintaining temperature during a heated stone massage. Intensify the soothing and detoxifying effects of far-infrared rays with this heat reflective Mylar thermal blanket. This blanket can be used with your far-infrared ray therapy mat to enhance its benefits. Turn your HealthyLine Mat into a Sauna THE ULTIMATE HOME SAUNA EXPERIENCE Take any HealthyLine mat and cover it with a towel or waterproof cover. Turn The temperature on to the maximum setting of 70 degrees Celsius or 160 degrees Fahrenheit. Now, you're going to lie down on the mat and cover yourself with a heavy blanket or our special mylar foil blanket which locks in 97% of the heat. Make sure the foil blanket covers your whole body, with just your head out, and is tucked underneath the mat to prevent any heat from escaping.