LYYHTY Ergonomic Office Chair Black, High Back Mesh Chair with Adjustable Lumbar/Headrest/Height, 330Lbs Capacity, Silent Casters, Home & Office Use

S-Shaped Ergonomic Back Design：The back adopts an S-curve structure that fits the natural arc of the human spine. Paired with an adjustable lumbar pillow, it actively supports the lumbar spine, disperses back pressure, and reduces back pain even during long sitting (e.g., working, studying). It helps maintain correct sitting posture and eliminates "long-sitting fatigue". Multi-Directional Adjustment for All Users：Supports 3 core adjustment functions—lumbar pillow slides up and down (fits lumbar positions of different heights), headrest adjusts height and angle (supports neck to avoid forward tilt), and seat height lifts freely (matches different desk heights). Users from 5ft to 6.2ft can find a comfortable sitting position. Breathable Mesh & Sturdy Frame：The seat and back are made of high-elastic breathable mesh—dense mesh doesn’t sag, quickly dissipates body heat, and keeps you cool without sweating or sticking to your back in summer. The frame is made of thickened steel, paired with a 5-claw nylon base, supporting up to 330Lbs. It won’t deform after long use, ensuring strong stability. Silent Casters & Foldable Arms：Equipped with 5 silent nylon casters—slides smoothly without noise, no scratches on wooden floors or carpets. Arms can fold upward; when not in use, the chair can be pushed under the desk to save space in offices or studies, suitable for small apartments. Waterfall Seat for Blood Circulation：The front edge of the seat has a waterfall arc design that fits the back of the thighs, avoiding compression of leg blood vessels, promoting lower limb blood circulation, and preventing numbness when standing up after long sitting—enhancing comfort during 4-8 hours of work.