The Black Split-Back High-Back Ergonomic Office Chair with Headrest and Fixed Padded Armrests, model ERG-SB705-BLK, is an unbranded ergonomic office chair built for sustained seated comfort across professional and personal settings. Its streamlined, professional black finish presents a polished, understated silhouette, with a structured high-back profile and integrated headrest that aligns cleanly with both modern and traditional workspace layouts, without overly bulky or distracting design elements. The chair is built with durable, performance-focused materials: the backrest uses breathable high-tensile polyester mesh to support air circulation during long periods of use, paired with a molded high-density polyurethane foam seat for consistent, resilient support. Its internal structural frame and internal back support frame are constructed from 30% glass-fiber reinforced polypropylene, supported by a glass-fiber reinforced injection-molded nylon five-star base, chrome-plated steel Class 4 gas lift, soft polyurethane casters with nylon hubs, and fixed armrests built with a reinforced nylon frame and padded PU top surface. The headrest is padded with molded polyurethane foam and wrapped in matching mesh for coordinated comfort. Functionally, the chair delivers targeted ergonomic support through its independent floating split lumbar pad and separate dual upper back thoracic support pads that contour to the natural curve of the spine. It offers smooth, customizable positioning with 130 mm of vertical seat height adjustment via a gas lift lever, a 45-degree backrest recline with multi-position lock and user-adjustable tilt tension, and a headrest with 80 mm of vertical travel and 45-degree rotation for personalized neck support. Dual-wheel casters enable easy multi-directional movement across floor surfaces. The chair accommodates users up to 136 kg, with a net weight of 23 kg, five-star base static load rating of 500 kg, 120000-cycle back mesh durability, 45 kg/m³ seat foam density with 60% rebound rate, and 100000-cycle caster rolling durability, supporting consistent long-term use. It is well suited for open-plan office workstations for 8+ hours of daily seated work for administrative and professional staff, home office dedicated workspaces where it fits standard desks for remote work, conference and meeting rooms for extended collaborative sessions, high-utilization computer labs and call centers for shift-based work, executive private offices where its black finish complements premium furniture layouts, and student study or dormitory spaces serving teenage and adult users. For procurement, each unit ships as one set across two cartons, with a reference assembly time of 40 minutes per set, packaged gross weight of 23 kg per set, carton dimensions of 850×420×720 mm, and carton volume of 0.26 m³ per set, supporting a load of 135 sets in a 20GP container at 85% space utilization.