The Chain Johnny uses a rip-resistant, 2-ply rubber/nylon material which protects the inside of a car much better than old-school methods such as towels or rags. It is also water resistant to protect the drivetrain itself when transporting bicycles on vehicle-mounted bike racks or storing them in the garage during the winter. Apartment and college dorm dwellers are also using the Chain Johnny to shield their greasy chains when storing their bikes indoors.