About this item Ergonomic Design Ergonomic design chair perfectly fits the body curve, giving you comfortable support, long time to maintain a sense of comfort, no pain. Ergonomic and comfortable office chair is the best gift for people who work long hours in the office. Superior Materials This office chair has passed the BIFMA test. The chair frame is composed of a star-shaped base, solid rolling casters and an SGS certified air cylinder, perfect for 250Lbs. The chair air lift handle helps the height can be adjusted from 17.7' to 20.7'. This is a sturdy office chair that will last a long time. Comfortable Seat The seat of the office chair is filled with high-density foam, with good elasticity, waterfall edge design can better reduce the pressure on your legs. Wear-resistant mesh backrest can be rocked(90-120°), Unique design of lumbar support can help maintain a comfortable sitting position. 360°Silent Wheels 60 degree swivel base and smooth rolling casters for easy multitasking. You