The High-Back Mesh Ergonomic Office Chair with Retractable Footrest and Adjustable Headrest (model ERG-OFC-MESH-FR-645) is an unbranded commercial-grade ergonomic seating solution designed for versatile seated work and leisure use. It features a streamlined professional black finish, with a contoured high-back profile paired with a polished aluminum alloy five-star base for a balanced, modern aesthetic that suits formal and casual space layouts alike. Built for long-term durability, the chair uses a 1.5mm thick alloy steel internal support frame. Its backrest is upholstered in breathable woven polyester mesh, while the seat pairs matching breathable mesh with a 50 kg/m³ high-density foam core 90mm thick for cushioned, temperature-regulated support. Armrests feature reinforced nylon supports with an aluminum core, topped with soft molded polyurethane pads. The chair rests on dual-wheel PA+PVC silent casters attached to the polished aluminum five-star base, with a Class 4 chrome-plated steel gas lift for height adjustment. It supports a maximum user weight of 150 kg, with the five-star base rated for a static load capacity of 1136 kg and casters tested to 98000 rolling durability cycles. The chair has a net weight of 18 kg, with packaged units shipped across two cartons weighing 23 kg total, requiring 40 minutes of assembly per set. Functional features are tailored for customized comfort: a side-lever gas lift provides 85mm of seat height adjustment to a maximum 555mm seat height from the floor, paired with full 360-degree swivel rotation. The 3D armrests offer height adjustment across 250mm above the seat, 120-degree rotation, and 60mm front-back sliding. The headrest adjusts 50mm in height and tilts 30 degrees to cradle the neck, while the contoured zoned lumbar panel moves 40mm vertically for adaptive lower back support. The backrest uses a synchro-tilt mechanism with 3-position lock up to 135 degrees, controlled by an adjustable tension knob, and a 400mm sliding retractable footrest tucks under the seat to support legs during recline. This chair fits a wide range of settings: it supports long-duration seated work in home offices, withstands daily multi-user use in corporate open office workstations, delivers polished comfort for manager or executive private offices, and accommodates extended seated leisure for gaming and home entertainment. It is compatible with users up to 190cm tall, and pairs with standard 760mm height office desks to support proper seated posture. When procuring, buyers should account for the two-carton shipping configuration, required assembly time, and weight capacity to align with intended use cases and space constraints.