Form foam seat with flattened seat edges and a high backrest featuring custom upholstery design, durable and long-lasting. The backrest provides optimal support and stability due to its three-dimensional shape. The high foam density prevents sagging and ensures long-lasting comfort even during seating durations exceeding 8 hours. The height-adjustable backrest allows for individual adjustment to the lumbar area. The bevel on the front edge of the seat prevents blood clots in the thighs. The seat and back move synchronously. The chair follows the movements of the seated person when opened. The movement can be locked at any angle. The counter-pressure of the backrest can be continuously adjusted using a handwheel. The back is constantly supported, relieving the abdominal area, which helps avoid tension and promotes an upright sitting position. This achieves a homogeneous pressure distribution in the vertebrae. With individually adjustable pressure, the chair can be tailored to different body weights, allowing for fatigue-free work for over 8 hours. High stability.