Quote from their website: It is of fundamental importance that the potential difference (galvanic effect) that forms between the insoles is of a -------------natural character,--------------- connected with and synchronized with the nature and biorhythms of the organism. End of quote.
This bit of info I would agree with !
In other words, they are using Copper for one foot and Zinc for the other foot, and if your Body may have an organ which may be needing the Electro-magnetic Energy Released from either of these and this organ of the Body may Receive connection of this Energy by the Proper placement of the correct Metal on the Correct corresponding foot(in other words, if the foot it is used on has it's energy points connected correctly to the Organ in need of this Metals Electro-magnetic Energy) and the Foot then sweats and Causes a "Natural Electro-magnetic Energy Release" because of the Salts in the sweat, then that organ which may have it's Energy points located in that Foot may then be supplied some of what it may need !
So, it may be a Crap shot as to if you get the correct Metal on the correct foot to match up with the Organ Lacking it's needs, because each foot has energy points specific to different organs of the body, just check a chart on Reflexology points !
But, just the Presents of the Copper and Zinc may provide the feet and sensory points in the feet to provide a Better flow of Electro-magnetic Energy thru the Energy points which are in each foot by reaction against the Salts which may Flow out of the Feet in the sweat from the Feet !
So, I can see where this may have some merit, if the correct conditions were matched up in the body !
They may be fun to play with and do some testing for someone who may know what they were looking for and had some way of testing the effectiveness , as to if one could properly match them up to the correct feet and Energy points in the Feet !!