I looked at the earthing flipflops and must say I am disappointed in the lack of straight info about them.
The fact is, as far as I can tell, you could stick a brad through your flip flop and splay the ends, and be doing just as well. ( as I opined/questioned about, a while ago, on this forum.)
I don't like the vibe I get from the David Wolfe and company
earthing stuff lately-- Seems to be all about sales...or aquisition...alas. This thing that would appear to take over the best of minds/hearts/souls...