The cushion gently lifts and supports the spine, leaving room for the tailbone while seated and promoting healthy posture by naturally aligning the spine and relieving pressure on the lower back. circulation is improved by reducing pressure on the underside of the thigh. Features -Color:Grey -Material: Cotton -Size: 45.00X40.00X12.00cm/17.68X15.72X4.72in -The height of the cushion is perfect to level out and balance the angle of pelvis to my knees. -It lifts your pelvis higher than your thighs, which helps naturally your back and provide comfort. -Non-slips bottom design and the bottom grips the seat doesn't slide around. -The simple design of this seat cushion is easy to remove and carry outdoor. -Suitable for every occasions, office chair, car seat, desk chair , train and airplane seat, classrooms or wheelchair use. Package list: 1 Cushion