Supports the entire back, ideal for prolonged sitting. Consists of 2 wings, each of which is individually movable and thus optimally adapts to the shape of the back. Adjustable in 7 heights between 14 and 23cm for personal comfort. Easy to attach: elastic and flexible strap attaches easily to standard office chairs. Meets the ergonomic requirements for office activities with... visual display units confirmed by FIRA Int. Ltd, an independent ergonomics accreditation body (ISO 9241-5:1998).