Your lower back is supposed to retain a natural curve...but that's not provided by many car seats, including ones with lumbar supports. That's where the Sacro-Ease Komfort Kush comes into play. The Komfort Kush is an orthopedically-designed wedge that features an inch-thick layer of poly foam at its top surface, as well as a cutout for the tailbone area. The Komfort Kush elevates the hips and thighs, tilting the pelvis slightly forward for the natural curvature that your lumbar region needs. Machine-washable ultrasuede surface with non-slip underside. Ask truckers, cops, cabbies, bus drivers, pilots or anyone else who spends long hours behind the wheel -- the Komfort Kush is a safe bet for your back.