Premium Memory Foam Car Seat CushionThe seat cushion for office chair and lumbar support pillow are made of pure high-density premium durable memory foam.The office chair cushion not only provide support hardness, but also give you with more soft comfort than donut pillow. Seat CushionThis sciatica pillow for sitting curved design minimizes pressure by cradling your bottom and providing evenly distributed support. Best back support pillow and tailbone cushion. Back CushionThe contoured shape supports your back's natural curve for proper spinal alignment and to promote proper posture. The back pillow also has UNIQUE POCKET FOR PHONE or other things. Works with Any ChairOur Chair Pillow features a non-slip, rubber bottom to ensure it stay firmly positioned in a seat. 3D Breathable Washable Mesh CoverKeeps air flowing and comfortable all day, with removable cover which is easy for cleaning.