Coccyx Orthopedic Wedge Cushion, memory foam for Prostate Hemorrhoid Tailbone Sciatica Back pain comfort & relief great pad for office chair sitting driving truck medical grade Ergonomic support seat Measuring 18" x 14" x 3", designed to reduces pressure on tail-bone, numbness, pressure sores Comes in new popular gray color, instant use.. no inflating needed, weighing 1.6 pounds (720g) Easy cleaning removable washable & durable cover, you'll love this large breathable kabooti Extra soft premium quality pillow best for home, car, plane, bench, bleacher, travel or wheelchair This is a patent pending improved U Shape design, not an ineffective donut or gel one