Fully upholstered by means of a leather cover, made up of an open cell polyurethane foam block and a solid wood frame with thin canvas strips. All this structure is protected by a compressed wood cover. SeatCold moulded polyurethane foam ‘UNIBLOCK 2’ system _later upholstered by means of a leather cover_, which enfolds an injected polypropylene frame completely. All this structure is protected by a beech compressed wood cover. The seat pan folds by means of an automatic slow noiseless maintenance-free double spring.