25 mm poplar plywood base structure with internal uprights also made of poplar plywood. Inside and outside honeycombed in 4-mm poplar plywood. Seat in 25-mm poplar plywood in full panel with perforations for ventilation. Seat padding of polyurethane foam in various densities: Lower central part in load-bearing density 35 Fe, upper part and rounded edges in elastic density 35 Fe and outer and perimeter band in rigid 30 FE. Lower seat perimeter in load-bearing polyurethane density 30 grf. The upper part of the seat covered with 3 cm memory foam and acrylic flap grams 200. Seat cover not removable. Steel feet 20 plywood base with laminate perimeter edging.