Thermacare Heatwraps Lower Back and Hip LG/XL, 2 Count (Pack of 3) - ThermaCare Back Pain Therapy: Up to 16 hours of pain relief. - Of all the heat patches for back pain out there, only ThermaCare Back Pain Therapy HeatWraps are clinically proven for pain relief and increase blood flow to help accelerate healing. They're portable and deliver 8 hours of continuous, real therapeutic heat and keep relieving pain for an additional 8 hours after you take them off. Ordinary heat patches for back pain merely create an artificial sensation of heat. In fact, the American College of Physicians (ACP) recommends real heat as the first defense against lower back pain. A review of studies found that applying therapeutic heated back wraps could provide significant relief for those with acute lower back pain. How To Use: Make sure the skin where you're applying the wrap is clean, dry, and free of any recent makeup, moisturizer, or lotions. Put the wrap flat on your skin. Make sure the darker heat cells are placed toward your skin. Make adjustments to firmly “lock” it in place by attaching the Velcro to the elastic, but don't over-tighten it.