The lower back is one area that needs a firm bolster, even in cars with well-designed seats and lumbar supports. The Sacro-Ease Keri Back is designed to give that support, with a natural curve that's backed up by an easy-to-shape steel frame and rubber stays. Choose from vertical or horizontal mounting straps (the vertical straps are great for concave seats). Internal memory foam helps the backrest adjust to your contours. The Sacro-Ease Keri Back is a great choice for older high-mileage cars with soft, sagging upholstery and springs.