According to Earth Runners:
By syncing up with the earth’s circadian rhythm (24-hour cycle) by exposing our biology to the Schumann Resonance via earthing shoes, the body is able to calibrate to its natural electric state and slow down. These slower alpha brain waves help to improve quality of sleep and reduce recovery time by improving one’s sleep economy.
Wearing earthing shoes while exercising outdoors increases your cardiovascular capacity yielding greater endurance.
Remaining grounded in nature increases mental clarity and focus while enhancing one’s feeling of connection.
The following video demonstrates how effectively the conductive lace-circuit works to ground the body through the copper plug on the bottom of the sandals: