Here is the part most people have never heard. The earth has a soft, natural charge, and for most of history we stayed in touch with it all day through bare feet on grass, soil, and sand. Today we spend our lives in shoes, cars, and beds, and this slowly cuts us off from it.
This sheet brings that touch back. It has thin conductive threads built right into the cloth, and a thin cord runs from the sheet to the ground hole of your wall socket, which is the same safe earth connection your home already uses.
To be very clear, no electricity runs through the sheet, and none runs through you. All it does is link you to the earth's natural charge, the same way standing with bare feet outside would.