“Earthing,” 

also called “grounding,” stems from the idea that in modern city life we no longer have direct physical contact with the earth, and therefore are losing out on purported health benefits. According to earthing proponents, you can ground yourself by walking outside barefoot, sitting with bare hands in contact with the ground, or being connected to the earth via grounding devices that allegedly transfer electrons from the earth to your body. There are even special shoes that feature copper contacts in the soles, thus facilitating a link between your body and the earth. I do find walking outside barefoot to be refreshing, but I don’t see a lot of evidence that these grounding devices provide health benefits.

The theory is that electrons drawn into the body from the earth neutralize damaging free radicals and reduce disease-related chronic or acute inflammation. In one investigation, participants slept on a special mat that had a connection to a grounding device outside the house. When compared to the ungrounded participants in the same study, the grounded ones showed changes in some biomarkers including serum sodium, potassium, magnesium, iron, total protein and others.

A handful of small studies have found that grounding appears to provide some general health benefits, such as better sleep, less pain, reduced stress and tension, and better immune function compared to study participants who weren’t grounded. One study suggested that earthing eliminates the potentially harmful effects of the electromagnetic fields given off by all the electronic devices that surround us.

It is notable that these studies involve participants using various grounding devices, not walking barefoot.

https://www.drweil.com/health-wellness/balanced-living/healthy-living/is-there-anything-to-earthing/