Most footwear today is made with plastic/rubber composite soles and do not conduct the Earth’s electric energy.
Shoes with leather/hide soles, which were the primary footwear material in the past, or specially designed conductive/electrostatic discharge shoes will ground you if you are walking on a conductive surface.
Please note: Dry leather isn’t conductive, but damp leather is. When your foot perspires and moisture from the ground dampens the leather, the energy from the Earth is able to travel through the leather and into your body. Also, very thick leather soles may not allow moisture through, so a thinner sole is better for conduction.
Check out our Grounders Flip Flops that will ground you while walking on a conductive surface.