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. 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.