Polyester knit with spandex added to the yarns. Special Stretch Fabric Follows Vehicle Contours. Inside is 100% Cotton Sheared to a Fleece Finish. High performance indoor fabric. Super soft fabric pampers the paint, the chrome, anything the fabric touches. Highly breathable fabric prevents vapor and heat from becoming trapped under the cover. Ding and dent protection: Fabric construction helps provide protection from minor garage. Machine washable and is easy to maintain in most front load washer/dryers.