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 structure office chair is the best gift for people who work long hours in the office. Comfortable Seat: The seat of the office chair is high-density sponge padding, good resilience, reducing leg pressure. High breathability. Wear-resistant mesh backrest can be rocked(90-120°), Unique design of lumbar support can help maintain a comfortable sitting position. 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". 360°Silent Wheels: 60 degree swivel base and smooth rolling casters for easy multitasking. You can move easily without making noise. This office chair is perfect for offic