Kayaks can also be classified by their design and the materials from which they are made. Each design has its specific advantages, including performance, maneuverability, stability, and paddling style. Kayaks can be made of metal, fiberglass, wood, plastic, fabrics, and inflatable fabrics such as PVC or rubber, and more recently expensive but feather-light carbon fiber. Each material also has its specific advantages, including strength, durability, portability, flexibility, resistance to ultraviolet, and storage requirements. For example, wooden kayaks can be created from kits or built by hand. Stitch and glue, plywood kayaks can be lighter than any other material except skin-on frame. Inflatable kayaks,[9] made from lightweight fabric, can be deflated and easily transported and stored, and are considered to be remarkably tough and durable compared to some hard-sided boats.[10][11]