Product Details Upgrade Ergonomic Design: The TIFOR seat cushion features a unique ergonomic and orthopedic design to help relieve sciatica, pelvic, cheekbone or tailbone pain while driving, reducing leg pain, fatigue, and numbness. Universal Size: Measuring 16.8 x 18.3 inches wide and 0.78 inches high, this seat cushion ensures a universal fit for most vehicles, providing perfect waist support and increasing seat height for improved driving vision. 100% Comfort Cushion: Made with high-density comfort memory cotton, the TIFOR seat cushion offers maximum comfort and support for truck seats, car seats, office chairs, and more. Breathable Mesh Cloth Surface: The high-quality breathable cotton cloth surface ensures a comfortable experience in any season, with a removable fabric cover for easy cleaning. Non-slip Bottom Design: The silicone anti-slip bottom and telescopic buckle design keep the seat cushion firmly in place, while the hollow design ensures breathability without feeling stuffy.