Yeah FIR heating and therapy is very well documented and understood, and there is plenty of evidence that it works. The negative ion treatment the Rambo ionic rug claims I also think is BS however. Negative ions work, but only in quantities millions of times greater than what a rug can possibly...
Ah yes, I remember thinking the description of that rug was suspicious. I'm always skeptical of magnetic rugs, let alone reflecting magnetic fields and therapeutFaraday cages.