structural:reformatting
Materials

A couch consists of a frame, springs, padding, and a covering. The frame is usually made of wood, but can also be made of steel, plastic or laminated boards. Sofa padding is made from foam, down, feathers, fabric or a combination thereof. Sofa coverings are usually made out of soft leather, corduroy or linen. Couches commonly have springs under the padding for more support, although some don't.