The Fellowes Ultimate Back Support helps to reduce tension associated with extended desk work with a two-tiered back support system. A mid spinal support with memory foam cushion promotes good posture and a lower lumbar support with three memory foam sections conforms comfortably to the body\'s natural curvature.Suitable for use on most chairs, this black back support also features a unique Tri-Tachment for a fixed position without the need to re-adjust.Innovative Tri-Tachment™ ensures stability eliminating constant readjustment, fully adjustable design allows fitment to most office chairs, 3 Section lumbar support expands and contracts to natural body curvature