Extra Large Design: Measuring 21.5*17.7*4inches, our seat cushion is significantly larger than most other office chair cushions on the market. This extra space ensures an excellent fitting for all, offering maximum support and comfort for long hours. Exceptional Support: Designed for offering maximum support, the seat cushion conforms to your body's shape, maintaining your posture and relieving pressure points while you sit for extended periods, whether in an office chair or car seat. 3.Long Lasting Comfort: With its high resilience, the seat cushion provides excellent comfort even after prolonged use. The high-quality material retains its shape even after hours of sitting, ensuring consistent comfort. 4.Versatile Use: The cushion is a perfect fit not only for office chairs but also for car seats, making it your ideal companion for long journeys and office hours.