A lumbar support belt is a back brace designed to provide firm support to the lower spine and reduce back pain. It helps stabilize the lumbar region, improves posture, and reduces pressure on spinal discA lumbar support belt is a back brace designed to provide firm support to the lower spine and reduce back pain. It helps stabilize the lumbar region, improves posture, and reduces pressure on spinal discs. Commonly used for muscle strain, sciatica, slipped disc, and during heavy lifting or long sitting hours.s. Commonly used for muscle strain, sciatica, slipped disc, and during heavy lifting o