Description: Material: The Ergonomic Chair Back Support is made of Viscose material, Portable USB port, can be used in the car or at home, three wind speeds, breathable.Ergonomic: The Back Support Chair has an ergonomic shape, not easy to deform, fits the curve of the waist, hips and back, maintain a good sitting posture.Foldable: The Lower Back Support, Foldable design saves storage space, is easy to carry and can be used at any time.Wide Application: The chair back support suits office chairs, computer desks, study rooms, restaurants, living rooms, sofas, recliners, and outdoors.Ideal Gift: The Back Support Pillow backrest and seat cushion are great gifts for drivers, programmers, students and sedentary people. Size Chart: 37cmx29cmx40cm/14.57inchx11.42inchx15.75inch Package Includes: 1 Chair Back Support Note: Please allow slightly errors due to manual measurement and different monitors.