Is "earthing"a legitimate condition?

I've been reading about something that barefooters and advocates of walking barefoot have been proposing:the concept of "earthing".According to what I've read,they claim that walking around with shoes all of the time and being around electrical-power technology causes an excess of positive ions to accumulate in your body-much more so than is healthy.They say that when you habitually go barefoot, particularly when you walk on soft grass,it causes the excess of positive ions to flow back into the earth and put negative ions into your body.This is supposed to lead to a better mental state and cause you to be less stressed and more relaxed.This there any truth to this,or is it just quackery?