Lumbar support is a back support that helps reduce the pressure on the spine and make sitting more comfortable. It comes with a seat cushion and a separate back cushion. Lumbar support is a back support that helps reduce the pressure on the spine and make sitting more comfortable. It comes with a seat cushion and a separate back cushion. I have been using this for a couple of weeks now and like it very much. Lumbar support is a back support that helps reduce the pressure on the spine and make sitting more comfortable. It comes with a seat cushion and a separate back cushion. Lumbar support is a back support that helps reduce the pressure on the spine and make sitting more comfortable.