Pack of 4 Units - Back Lumbar Support Mesh for Office Chairs / Car Seats Easily attaches to any chair by Elastic bands that will stretch to fit. The lightweight support gently cradles your back and encourages correct posture. Ergonomic design gives firm and comfortable support while breathable mesh material circulates air to keep you cool. Perfect for long hours of sitting, designed for work, travel, home Fills in the gap where your lower back arches into the chairs void.