Spine Lumber Half Roll Cushion provides support for natural spinal alignment, improves posture and reduces back pain. The D-Shaped Spine Lumber support, prevents for natural tendency to slouch when sitting which flattens out the back's natural curve and stretches out ligaments. Recommended for a mild to serious back problem where the lumbar spine needs to be kept in extension. It makes your chair ergonomic, making it comfortable to sit. Spine Lumber D-Shaped roll cushion has elastic strap to fix in position. It can be used in office chairs, cars or sofas etc. Velvet cover is Removable and Hand washable.