Shoes spare our feet from contaminants on the ground, but those remain in the soles of the shoes and are carried to wherever we go.
Wearing a shoe cover is the ideal way to stop contaminants in our shoes from invading places that we want to keep clean, whether those are hospitals, food industry or pharmaceutical facilities, or even our homes!
As a water proof barrier that acts both ways, the shoe cover also allows us to walk on unsanitized ground and still keep our shoes clean and protected from liquids or other products that may damage or contaminate them.