Originally Posted By: Pop_Rivit
That's completely incorrect. The openness of sandals in public exposes your feet and nails bacteria, fungus, feces and other materials that are in public areas. They also accentuate heel-strike impact because of the poor padding, negatively alter your bio-mechanics when you walk, negatively affect your posture, cause the wearer to take shorter steps, and lead to repetitive stress on the ankle and foot.
There's a good reason why people who understand what happens with the foot while walking or running don't wear flip flops or sandals.
Given the above, I'm surprised that the human species survived long enough to INVENT shoes.
It must have been touch and go there for a few tens of millenia...