Grounded, barefoot shoes made of cow leather and water buffalo leather soles.

Grounded shoes help recapture the connection to Earth's natural negative charge.  A copper plug sits in the sole of the shoe aiding the conductivity. 

Barefoot means that the shoe has a wide toebox so that your toes are not smashed together & natural barefoot movement is mimicked with a thin, flat flexible sole.

Rhizal shoes support proper foot mechanics and gait which strengthen muscles and bones in the feet and ankles and help prevent injury and stabilize the foot's arch.

Studies:
Daily activity in minimal footwear increases foot strength HERE
Effects of training in minimalist shoes HERE

There are multiple mens and womens styles & many colors; a short selection shown below.