Generally speaking, it is far infrared. Everything with temperature has a magnetic field because people's body temperature is not very high.
So the magnetic field is not strong.
But the principle of vibration is that as long as the frequency and band of the wave are close, it can vibrate.
Health quilts such as far infrared have this characteristic of vibrating with the magnetic field of the body in the early stage.
Make the human body feel very comfortable.
But not for long. It will never be ineffective for years or even 20 years, as the propagandist said.
Some marketers say that the effect is very good in the first month and will get worse and worse in the future.
Finally, the ordinary quilt (but a little better)