Powerfit Executive Chair introduces Bionic Spine technology that reacts to your individualized body and posture, providing unparalleled, nine-point pressure relief across your entire back. Double-winged support chips enhance support across the back muscle group. Pressure-sensitive sensors assist with proper back posture and alignment. Livemotion lumbar tracking supports the lumbar and spine when tilting. Mesh seat slides in or out to increase or decrease seat depth. Adjust armrests in three directions to your preferred height, angle and depth. Lever controls pneumatic height adjustment, back and angle tilt and tilt lock. Tilt tensions is made with two adjustment modes.