Features: Ergonomic seat cushion with 3 inch memory foam and W/U shape design provide targeted pressure relief for coccyx and thighs, promoting proper posture during prolonged sitting. Innovative curved contouring with breathable honeycomb structure even distributes body weight while preventing heat buildup, maintaining shape through extended use. Designed for office professional, drivers, and chronic sufferers needing enhanced lumbar support and improvement during 8+ hour sedentary routines. Fit securely on car seat, office chairs, wheelchairs, and seating for comfort during commutes or desk work. Antislip rubber base and removable polyester cover with 7 shape zippered simplifies maintenance while ensuring stability across multiple seating surfaces. Specifications: Product weight: 750g Size:Approx.40.89x45.97x5.72cm/16.1x18.1x2.25inch Color:Black Package Includes: 1pcs Orthopedic Seat Cushion note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.