Innovative Tri-Tachment ensures stability eliminating constant readjustment. 3 Section lumbar support expands and contracts to natural body curvature. Thoracic Support is contoured with a low density foam to optimise the postural support in a subtle application. Fully adjustable design allows it to fit most office chairs. Easy setup: Place support on chair, position your back and just clip the straps! Accredited by the FIRA International, an Independent Ergonomic Accreditor.