For the Mamy Blue armchair, the backrest structure is in moulded polyurethane foam. The spring system of the seat, in seasoned beechwood, consists of hand-tied steel biconical springs attached to jute belts. It can be upholstered entirely in Pelle Frau® leather or in many other combinations of saddle-leather, leather and fabric. The combination of various materials is enhanced by elegant visible contrast stitching. The soft optional head rest, padded with polyurethane foam and goose down, does not need to be fastened in place but simply placed on the backrest where it can be positioned as desired thanks to the counterbalance inserted internally. Mamy Blue has a 4-foot solid ash base with a wenge or moka stain, also in the swivel armchair version. For the Mamy Blue pouf, the structure is made from seasoned beechwood and birch plywood and upholstered either entirely in Pelle Frau® leather or in Pelle Frau® leather combined with fabric, as with the armchair.