80% Cotton/20% Polyester 【Unique design and Extra Large size】 Our product has two advantages: unique design and extra-large size. The unique design offers you wonderful support and comfort for both your hip and back; the curved seat cushion design provides you with a comfortable posture, and the massage-function lumbar support pillow gives your back more comfort. The extra-large size offers you more space to sit on the seat cushion. 【Designed for Comfort】 Our seat cushion and lumbar support pillow set is designed to provide comfortable seating for sedentary people, allowing you to focus on your work without discomfort. It is perfect for adults weighing between 100-220 lbs. 【Quality Memory Foam】 This memory foam seat cushion for office chairs is designed to provide great support with its high-density memory foam, while its highly elastic material ensures that it is resistant to deformation, even after prolonged use. This memory foam seat cushion provides maximum support and comfort while reducing pressure on the coccyx/tailbone. It is perfect for those who suffer from back pain, sciatica, or other issues caused by sitting for long periods of time. 【Relieves Pain and Improves Posture】 The unique ergonomic design of this tailbone pain relief cushion conforms perfectly to the hip curve, helping to promote healthy posture and improve blood circulation. It effectively relieves back pain, lower back pain, sciatica, and other issues caused by sitting for long periods of time. Additionally, this seat cushion for tailbone pain relief supports recovery from lower back problems, herniated discs, tailbone injuries, sciatica, and other spinal issues. 【Versatile and Portable】 This car seat cushion and lumbar support pillow set for driving is perfect for use in various settings such as office chairs, home chairs, airplane seats, train seats, car seats, or as a wheelchair cushion. It transforms any hard chair into a super soft and comfortable upgraded seat, allowing you to sit comfortably wherever you go. The extra-large size makes it easy to take with you and use in any situation. It is the best seat cushion for car drivers.