Soft, ergonomic seat with a rounded front edge that does not press on the thighs, padded with molded polyurethane foam, 45 mm thick. A chair with a synchronous rocking mechanism that allows you to fix the angle of inclination in the desired position (5 positions - one position for 90° angle sitting) with anti-shock function. Height-adjustable backrest As the backrest moves, the seat moves synchronously in the same direction, so that the lower back is not strained when swinging. Quality seat tapestry, tapestry abrasion resistance 150000 cycles according to the Martindale scale. The height-adjustable backrest is covered with a mesh material on the inside, the abrasion resistance of the mesh is 150,000 cycles according to the Martindale scale. Synchronous mechanism with individual adjustment of the backrest force with the help of a rotating bracket installed on the side under the seat. Possibility to fix the backrest in 5 positions or disable the fixation and allow the backrest to move freely. Adjustable 4D armrests with soft polyurethane top. Adjustable in height, depth and width. Chair with adjustable height and angle of inclination, mesh-covered headrest. The seat of the chair has a sliding function - the distance of the seat from the backrest can be increased or decreased within 40 mm. The chair is certified according to the EN 1335 standard. Chair on 5-wheel cast aluminum star. The wheels do not scratch the floor covering. Warranty-60 months.