High-Back Chair Comfortable Design: Height-adjustable headrest, double-layer Mesh upholstery. Sleek and Adjustable: Chic armrests with PU pads for style and flexibility. Premium Construction: High-density molded foam, synchronized-tilt mechanism. Customizable Features: 3-position back-locking, adjustable height/tilt tension. Certified Quality: Built to BIFMA standards for durability and safety. Effortless Adjustments: Class 3 gas lift for smooth height adjustments. Sturdy Base and Mobility: Stable 325mm nylon base, silent Nylon castors.