Pu OPTIMAL COMFORT: Ergonomic backrest cradles your body; well-padded backrest, built-in headrest and luxuriously upholstered seat keep you comfy even sitting for a long time NOT MORE TIRED FEELING FROM SEDENTARY SITTING: Swivel computer chair with wide and large size; the front of the seat has a waterfall edge giving extra support and comfort to legs; back is contoured to the body and helps relieve back fatigue MULTIPLE ADJUSTMENTS: Flip-Up armrests can be fully folded upwards for convenient uses and are saving space to put under the desk; ergonomic chair seat back reclines to 90-110 degree position and rocks to your weight; adjustable height of the seat is 16 1/2''- 19 5/8'' making it perfect for most of people STABLE AND DURABLE: Important accessories like armrests, tray, wheels and gas lift have been tested by the supplier and passed by BIFMA to ensure the high stability and durability of the desk chair; five-star castors with diameter of 27 1/2''; maximum static load capacity of 330.69lbs; anti-loosening screws keep sturdy after long term use