Adjusts to You, From Bottom to Top Whether you're working, gaming, or just relaxing, SIHOO ergonomic chair adapts to your needs. The headrest tilts and lifts to support your neck just right. The lumbar support shifts in height and depth to fit the curve of your lower back. Recline from 90° to 126° to change posture throughout the day. With smooth height lift and 360° swivel, you move freely and stay comfortablehowever you sit. Ergonomic Support Where You Need It Most Recommended by the Ergonomics Application Association, the SIHOO ergonomic office chair is shaped to match the natural curve of your spine. The split backrest cushions your back and helps relieve pressure along the spine. The waterfall-edge seat supports your thighs while improving circulation, keeping you comfortable through long hours at your desk. Stable, Durable, and QuietBuilt with a reinforced aluminum base and a dual-frame backrest, our desk chair holds up to 330 lbs with ease, staying sturdy and sup