Polyurethane Foam | Lower Back Stretcher utilizes a Sea-shell shaped design to completely support the lower back as well as mid back permitting complete comfort involving back muscle groups. | Back Stretcher with removable ball gives you 4 intensity-level options by letting you increase or decrease the support. Start at a level that is easy and comfortable for you and then progress through the different levels continually adding more stretch and extension to your body. | Relieve Back Pain Naturally, whether suffering from upper, middle, or lower back pain, you are able to target the area of pain by stretching and introducing progressive extension in your spine. Gently, you will be able to realign your spine and eliminate pain. | Lower Back Support is easy to use, 5 mins, 2 times a day is all it takes to improve back health. Progresses with you as you gain flexibility, improve posture, and build spine health. | Lumbar Support is made from a specialized type of polyurethane foam, similar to an advanced memory foam, designed to compress for comfort while maintaining its natural healing shape.