Markbass Cover Standard 104 HFMarkbass covers are made of the following materials:Outer layer: Polyester 600D x 600D PVCPadding material: PUR Foam 10 mmLining material: Nylon 190T PUThe lightness and portability of Markbass products is to some degree negated when heavy flight-cases are used. But when the musician transports his gear himself (in other words, outside of tour situations where the goods are transported by others), Markbass covers are a practical choice: lighter, less expensive, and still very protective.