[Ergonomic Design]Office chair back support designed to fit the waist contours, 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 lightweight, 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 daily life 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 shooting 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.