This Back Support for Office Chair comes with a stable bottom, ensuring it stays securely placed on flat chair surfaces without sliding during use. The breathable mesh fabric outer layer paired with high-resilience filling and hollow design keeps this Lumbar Support for Office Chair well-ventilated, preventing stuffiness during long hours of sitting. Designed for multi-scene use, this Ergonomic Back Support is ideal for office chairs, home seating, and other stationary seats, providing consistent comfort throughout the day. This Chair Back Support leverages body weight via lever principle to generate adaptive support, helping maintain a natural posture and fitting a wide range of body types (100-300lbs). Ergonomic Lumbar Support for Office Chair features a 3-zone (back, hip, spine) design that fits body curves, with dual back support areas and a hip pressure-relief groove to distribute body weight evenly.