Cercle office chair — the synchronized mechanism is integrated into the monocoque and optimized by Poltrona Frau for maximum comfort. The frame is polyurethane with a metal insert, and the padding is differentiated density polyurethane foam, quilted with polyester wadding. The base is aluminum, five-star, with a gas lift column in the color of the base. The upholstery is entirely Pelle Frau® leather.