The High-Back Ergonomic Mesh Office Chair with Adjustable Headrest and Lumbar Support from Bolongkeli Smart Furniture, model ERG-MESH-HB-001, presents a streamlined, professional silhouette finished entirely in matte black to complement diverse interior schemes. Its high-back profile extends to a contoured, adjustable headrest, paired with a supportive curved lumbar pad positioned in the lower back zone. The chair features a five-star caster base, with centrally aligned seat and backrest components that enable balanced, unobstructed movement around the central axis. Constructed for long-term durability, the chair pairs a breathable polyester mesh backrest framed in glass-fiber reinforced nylon with a cushioned seat built on a 14 mm thick plywood substrate. The seat core uses high-resilience molded polyurethane foam, upholstered in stretchy black woven fabric, with armrests finished in soft polyurethane padding mounted on nylon supports. The gas lift cylinder is made of powder-coated carbon steel, the five-star base is formed from reinforced black nylon, and caster wheels feature a polyurethane tread on nylon hubs for smooth, low-impact movement across flooring. The chair delivers targeted ergonomic adjustment to suit varied user needs. A pneumatic gas lift enables seat height adjustment to a maximum height of 550 mm, with 360-degree swivel functionality for easy access to surrounding work surfaces. The backrest reclines up to 135 degrees from its upright position, with an under-seat tension adjustment knob and lock functionality that secures the backrest in the upright position and multiple intermediate recline angles. The headrest offers 135 mm of vertical travel alongside 30 degrees of angle rotation, the lumbar pad adjusts vertically to align with individual user back curves, and armrests adjust 50 mm vertically to match desk heights. The chair supports up to 8 hours of daily use, accommodates users up to 190 cm tall, and holds a recommended static load capacity of 181 kg. This model is suited for a wide range of commercial and residential spaces, including private office workspaces for focused individual work, open-plan workstations where its neutral finish blends seamlessly with standard layouts, home office setups where adjustable features support shared use across household members, conference rooms where swivel and recline functions support long collaborative sessions, hot-desking environments where quick adjustment controls enable fast reconfiguration between users, and spaces with height-adjustable sit-stand desks, where its maximum seat height pairs well with variable desk elevations. Procurement teams should note that each unit ships in two cartons, with a reference assembly time of 40 minutes per set. The packaged product has a gross weight of 23 kg per set, and 135 sets can be loaded into a 20GP container at 85% space utilization, supporting efficient bulk ordering for large office fit-outs.