This 3.9 inches thick contoured memory foam cushion is designed to improve sitting comfort for extended periods. The ergonomic contour helps distribute weight and reduce pressure on the pelvis and posterior while supporting a more neutral seated posture. The cushion includes a removable, machine washable cover for easy care. Key benefits Ergonomic support: Contoured shape supports the pelvis and posterior to encourage a steadier seated position. Pressure reduction: Memory foam adapts to body shape to reduce concentrated pressure points. Comfortable for long use: 3.9 inches of foam provides cushioning for extended sitting sessions. Easy care and portability: Removable cover is machine washable for simple cleaning; lightweight and easy to move between seats. Product details Material: Memory foam core with removable fabric cover. Cover: Removable and machine washable. Size: 18.1 inches long by 15.7 inches wide by 3.9 inches thick at the thickest point. Suitable for home, office, and travel use. Practical use scenarios Office: Place on an office chair for daily desk work to add extra cushioning and support during long shifts. Travel and commuting: Use on car seats or airplane seats to increase comfort on longer trips. Home seating: Add to dining chairs, sofas, or recliners when extra support and cushioning are needed. The cushion offers a straightforward, practical option for improving seated comfort and maintaining a more comfortable sitting experience across multiple seating environments.