The transit lumbar support is made of TEMPUR®, a visco-elastic material. The material has an open cell structure and because it moulds through body heat to the exact contours of your body, it offers a perfect support for your back. It provides pressure relieving comfort and can ease back discomfort by ensuring the correct sitting posture. A handy lumbar support for use when travelling or at home. Easy to place into the desired position between the seat and back.