Muuto Chair Grey Metal. Dimensions: H 77 x W 51 x D 53 cm – Seat : H 46 cm. The FIBER SIDE chair is the latest addition to the FIBER chair family, which also means it is constructed with the same elegant innovative bio-composite material with up to 25% wooden fibers. With an eye for detail, every line and every curve of the FIBER SIDE chair has been designed to balance maximum comfort with minimum space. FIBER SIDE chair has a visual light expression that allows great freedom of movement for the user and a design that can easily slide under all tables.