637 Utrecht is an armchair by Gerrit T. Rietveld for Cassina. Steel supporting frame. Polyurethane foam and polyester padding. Fabric upholstery with blanket stitching. Leather upholstery is available for the armchair and the straight sofas. Feet in black plastic material. Contrasting stitching, emphasizes the geometry of the armrest.The armchair Utrecht stands out for its design constructivist: volumes that incorporate forming a seat original and futuristic. An architecture soft and airy, with comfortable seating and soft and always supported. The sign that characterizes this armchair is the armrests, which by their geometrical line, they are in contrast with the soft lines of the seat. Gerrit Rietveld came up with the design for the Utrecht armchair in 1935 while working for the Metz & Co. department store in Amsterdam, where his brief was to make a chair for serial production.In this version: upholstered in fabric cat. L - Ortigia 13L659 with blanket stitching in natural thread