On the Outside Constructed out of water and tear resistant Dukktex^TM fabric. It features a Cloud Weight ^TM design, which makes the cases stronger and 33% lighter than conventional frame construction. In Line Skate Wheel System is designed for smooth operation and long life. Corner mounted wheel housings add an additional level of protection. Each piece comes complete with self-repairing nylon zippers with Smooth-Zip ^TM movement. The zipper pullers are finished in high quality chrome and are easy to grasp with our braided rubber accents.On the Inside The interiors are fully lined to protect the contents of the case and provide a sophisticated look to case interiors.