seat cushion pillow for office chair memory foam for back pain & sciatica relief, non-slip orthopedic coccyx for tailbone pain-contoured posture corrector for car computer chair dr.comfy brand: dr. comfy | name: chair cushion | material: bamboo charcoal memory foam | applicable scenarios: office, car, home | size: 17.7*13.8*7.9" | weight: 31.5 oz | reminder: memory foam cannot be cleaned and sun exposure