This pad goes over top of the BioMat, to provide extra cushioning, while still allowing the infrared light to pass through into the body. Most BioMat owners do not use the Quantum Energy Pad, since the BioMat is already very comfortable for regular 30-60 minute sessions. But for longer term use, or overnight use, especially for side sleepers, it can be a good accessory.
The Quantum Energy Pad is about 2 inches thick, so it can reduce the infrared transmission to some extent. To compensate, it may be necessary to increase the temperature setting by one or two notches.