Four ergonomic zones in this office chair support your head, back, hips and legs during work or study. The wide backrest and curved armrests help promote posture while easing shoulder and arm pressure, and a padded headrest supports your neck to reduce stiffness. The 21 x 18 in seat combines elastic sponge filling and faux leather for cushioning and easy cleaning. A 102°-122° rocking backrest, 18-21 in adjustable seat height and 5-point metal base with 360° wheels allow reclining, height changes and smooth movement up to 242 lbs.