The High-Back Mesh Ergonomic Office Chair with Adjustable Headrest and Fixed Armrests (model ERG-OFCH-MSH-625, unbranded) is a purpose-built seating solution for long-duration desk use. Its form features a tall, contoured mesh back, padded fixed armrests, an independent height-adjustable headrest, and a classic five-star base supported by rolling casters, creating a clean, professional silhouette that blends function with understated, versatile styling suited to a wide range of interiors. Its unified design balances generous seating space with a compact footprint that avoids overcrowding surrounding work surfaces. The chair is engineered for long-term durability across high-use settings. Its backrest uses breathable woven polyester mesh stretched over a PA nylon frame reinforced with 20% glass fiber, to support air circulation during extended sitting. The seat cushion core uses high-density cold-cured molded foam supported by a molded plywood board below, for consistent, even weight distribution. Fixed armrests feature PP nylon frames topped with thick PU padding for soft forearm support, while the headrest combines a molded foam pad over a mesh insert for gentle neck contact. The reinforced nylon five-star base supports a SGS Class 3 steel gas lift, paired with dual-wheel mute polyurethane casters that roll smoothly across hard floors and low-pile carpet. Core functional features are tailored to user comfort: pneumatic seat height adjustment is controlled via an under-seat lever, the headrest adjusts vertically to support proper neck alignment, and the chair offers full 360-degree swivel for easy access to surrounding workspace items. A tilt function allows the backrest to recline with a single-position upright lock, paired with an under-seat tension knob to adjust recline resistance to match user weight. A fixed contoured lumbar zone aligns with the natural curve of the lower back to reduce postural strain over long sessions. The chair supports a recommended maximum user weight of 136 kg, with durable component ratings covering repeated use of the gas lift, tilt mechanism, and casters. This model fits a broad array of spaces, including corporate open office workstations, home offices and study rooms, conference and meeting areas, coworking and shared workspaces, setups paired with height-adjustable standing desks, and student dormitory study zones. For procurement planning, note that each unit ships in two cartons, with a reference assembly time of 40 minutes per set, and structured packaging dimensions that support efficient container loading for bulk orders.