If you suffer from lower back pain, you know how important it is to find a comfortable chair that provides support. But even the best office chair can't always provide the necessary support on its own. That's where a lumbar pillow comes in. A back support pillow is a small, oblong pillow that is designed to be placed at the small of your back for added support. Many people find that using a lumbar pillow helps to relieve back pain and improve their overall comfort while sitting in an office chair.