IKEA Markus Office Chair

no stains / no wear and tear! Height-adjustable seat allows you to adjust the height so that back and legs are at a 90° angle. Synchronized tilt mechanism allows the chair to move with you. The backrest moves more than the seat when you lean back, so torso/hips open up. To adjust the tilt tension, turn the knob under the seat to increase or decrease the resistance. The mesh material of the backrest lets air through to your back during long sitting periods.