Shell in plastic composition with up to 25% wood fibers. The wood fiber and plastic blend is injected into the mold, forming the chair's shell. The Steel sled base is CNC-bent and powder coated. Clean with a moist cloth. If necessary use a little dish soap on the cloth. For upholstery versions please find cleaning instructions for your chosen textile at www.kvadrat.dk. For leather upholstery versions, clean the leather with a dry cloth regularly. Treat the leather at least four times a year using only special leather treatment products for aniline leather.