Lower Back Pain Relief. The Elasto-Gel™ Hot/Cold Lumbar Wrap can help relieve lower back pain and also hip and abdominal pain. Hook-and-loop closures hold the wrap in place, so it can be worn under clothing and does not need to be used while in a stationary position, which means you can still be mobile while you are receiving your therapy for lower back pain. The wrap can be used in cold treatments for 20-40 minutes per application. Elasto-Gel will remain flexible even at -20 F. In order to relax muscles use the Lumbar Wrap as heat therapy. A few seconds in the microwave can turn the wrap into a soothing blanket of relief. Available in two sizes: Small/Medium fits waist size 24”-36;” Large/X-Large fits waist size 36”-52.”