Back pain is often caused by tight muscles. ThermaCare^® Back Pain Therapy HeatWraps deliver 8 hours of continuous, therapeutic warmth and keep relieving pain for an additional 8 hours after you take it off. In fact, the American College of Physicians (ACP) recommends real heat as a first defense against acute lower back pain. Available in two sizes, these single-use wraps are designed to provide pain relief at home or on the go.Title:Warnings,