What materials are the rain covers made from? The rain covers are 90% nylon and 10% TPU (Thermo-plastic polyurethane). Can't find the answer you're looking for?Submit a support request Related articles Do Thule Pack ’n Pedal products contain PVC? I've lost my keys. Where can I buy new ones? What about roof box maintenance? How do I anchor loads on a roof rack or inside a roof-box? How can I create more clearance for pedaling action when panniers are mounted?