Disposable general purpose shoe covers protect against contaminants in a wide range of environments and applications. They have nonskid bottoms with PVC (polyvinyl chloride) tracks to increase traction and safety. Disposable general purpose shoe covers are typically made of lightweight, breathable materials like polypropylene. Polypropylene has excellent resistance to water, chemicals and abrasion. Shoe covers may also come with seams that are serged or heat sealed. Serged seams work well in dry environments, while heat-sealed seams work well in wet environments.