A D-shaped lumbar support designed by Robin McKenzie, this role rests opposite the back of the chair. For self-treatment of low back pain, place the support on the back of your favorite chair or car seat. Resting against the D-shaped pillow improves posture and helps correct mechanical back pain. Each cylinder has a removable polyester cover with a soft mask that absorbs moisture. It has a built-in adjustable strap, contains latex.