Everlasting Comfort black flagship seat cushion for office chair. Tailbone pain relief cushion/Coccyx cushion/Sciatica pillow for sitting. Ergonomic design for improved posture. Effective pain relief for lower back. Cushion evenly distributes weight to reduce pressure and pain. Plush cover is machine washable and tumble dry. *Do not wash memory foam*. Measures 17.5” length x 14” width x 2.75” height memory foam. This item is brand new and has never been used at all. * Matching lumbar chair pillow support available in other listing in my closet* *Not eligible for bundling due to weight of item*