The Black Dual Split-Back Ergonomic Office Chair with Headrest and Fixed Armrests, model EOCH-SB01-BLK, delivers structured, task-focused seating for daily work and study use. Its visual design features a sleek, uniform black finish with a contoured dual-split high backrest, paired with a wide square seat, integrated fixed loop armrests, a stable five-star caster base, and an attached adjustable headrest for a polished, professional silhouette that balances functional support and understated style suitable for both commercial and residential settings. Built for long-term regular use, the chair combines durable, performance-focused materials across every component. Its backrest uses breathable polyester mesh stretched over a reinforced PA plastic inner frame to support air circulation during extended sitting. The seat features a molded high-density polyurethane foam core rated for 50kg/m³ density, wrapped in wear-resistant polyester fabric tested to withstand 40000 double rubs for sustained surface durability. Fixed armrests are constructed from reinforced polypropylene, while the five-star base uses glass-fiber reinforced nylon fitted with smooth nylon twin-wheel casters. Height and tilt functionality rely on a Class 3 chrome-plated steel pneumatic lift and a 2.5mm thick steel tilt plate chassis for reliable structural performance. Core functional features support flexible, user-aligned comfort: the seat offers 100mm of pneumatic height adjustment accessed via an under-seat lever, reaching a maximum seat-to-floor height of 530mm, with a dedicated tension knob to calibrate tilt resistance to individual user weight. The split backrest reclines to 135 degrees with three lockable positions, supported by fixed contoured dual-pad lumbar support for consistent lower back alignment, while the headrest adjusts 80mm vertically and rotates 30 degrees for customized neck support. The chair enables unrestricted 360-degree swivel and smooth omnidirectional caster movement on hard floors and low-pile carpet, with a 160kg maximum recommended user weight. This chair fits a broad range of seating scenarios: it supports 8-hour daily desk work at open-plan office workstations, fits compact home office setups for remote workers, provides mobile collaborative seating for small meeting rooms, slides cleanly into standard cubicle desk cutouts for long typing sessions, and suits teen and adult users in home computer and study rooms, pairing best with desks up to 2.4m in width. Procurement teams and individual buyers should note the chair ships in two cartons per set, with a 40-minute assembly time per unit, and a packaged gross weight of 23kg per set. A 20GP shipping container can hold 135 sets at 85% space utilization, making the model suitable for both small individual purchases and bulk commercial fit-outs. Fixed armrests should be confirmed for desk clearance prior to purchase to ensure smooth tuck-under access where needed.