This ergonomic office chair is designed to provide unparalleled comfort and support, making it an ideal choice for both home and professional workspaces. The high back, crafted from a blend of 70% PP and 30% fibreglass, fits the neck perfectly, ensuring proper posture and reducing strain. The aluminum dual-track lumbar support offers smooth 7-level height adjustment, allowing you to customize your seating experience for optimal support. The premium mesh material matches the frame, providing excellent breathability and a fully unified colour scheme that enhances the aesthetic appeal of any room. The soothing rocking mechanism allows for smooth forward and backward tilt, promoting superior lumbar comfort during long periods of sitting. Integrated armrests, also made from 70% PP and 30% fibreglass, offer sturdy and comfortable arm support. The seat cushion, built with a 10-layer curved board and premium moulded foam, meets US standard fire resistance tests, ensuring both safety and durability. The medium butterfly chassis features an upright position lock and a robust 2.5mm thick explosion-proof mechanism, ensuring daily stability and safety. The thickened aluminum alloy track for lumbar support is significantly sturdier and more durable than plastic tracks, offering rust-proof and break-resistant performance. A convenient dual-function lever allows for easy control of both seat height and the rocking mechanism, while the SGS-certified black Class 3 gas lift cylinder ensures smooth and reliable height adjustments. Supported by a durable nylon 5-star base, this chair has passed the BIFMA 1136kg static pressure test, guaranteeing exceptional structural stability.