Ergonomic executive office chair. Synchron mechanism multi-block 5 positions that allows the simultaneous adjustment of the seat and backrest. Anti-shock function that prevents the back to back in an upright position inadvertently. Voltage regulator that allows you to adjust the intensity of oscillation. Lumbar support adjustable in height. Fixed armrests with soft top in black polyurethane anti-shock and anti-scratch. Ergonomic seat foam. Black breathable mesh back, black fabric seat.