[Ergonomic Design]Office chair back support designed to fit the waist , give good lower back support and reduce fatigue. Mesh lumbar support also can improve sitting posture [Comfortable Back Rest]Mesh back support with massage granules, provide massage feature, make you feel stinging and can effectively relieve the stiffness of your back/waist [Breathable]Chair back support made of high-quality materials. The hole of the mesh lumbar support keep the air flowing, it does not feel stuffy during use even in summer [Easy Installation]Back rest for office chair is , easy to carry. Mesh back support with elastic strap, can be installed in minutes, and fix the mesh lumbar support to office chair/car seat [Back Support]No unpleasant smell, chair back support is suitable for the most people. You can use the mesh back support in your office, car and home, it's convenient for your colour:Black Material:Polyester + polyethylene size:40 x 31 x 13.5cm Package Contents: 1 x Office chair back support Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.