Transport bicycles with no damage, no mess! The Chain Johnny uses a rip-resistant, 2-ply rubber/nylon material which protects the inside of a car. It is also water resistant to protect the drivetrain itself when transporting bicycles on vehicle-mounted bike racks or storing them indoors. The unique drivetrain shape and VELCRO® closures make installation a breeze. Simply slip the Chain Johnny over the front gear, then the chain and finally the rear derailleur. Seal it all up using the Chain Johnny’s Velcro closures.