A height-adjustable task chair characterized by its dark grey polypropylene frame, with its backrest either in a choice of 6 mesh colours, or fully upholstered. The upholstered seat has high density polyurethane foam. A syncron mechanism assures gaslift regulation and backrest tilt, lockable in five positions, with anti-shock mechanism and bodyweight adjustment. 5-spur dark grey nylon base with self-braking rubber castors. Optional features: height and depth-adjustable lumbar support; mesh or padded headrest; polished aluminium base; slide system to adjust seat depth; castors with holes. In addition, a choice of four armrest types: fixed; height adjustable (1d); height and depth adjustable (2d); height and depth adjustable with rotation (3d).