Seats are stress-resistant polyurethane foam of varying densities and polyester fiber filling on a wooden frame. The legs are beech, screwed to the structure, which are permanently attached to the frame. The seat cushions, non-reversible, are made of polyurethane foam of varying density and polyester fiber filling. The backrest cushions are goose down. The fabric covers of the Big Mama collection are removable, except for Papa seats and leather versions.