ThermaCare Back Heatwraps offer drug-free, single-use, self-heating pain management for muscular pain in the lower back, neck, and shoulders. These wraps provide up to 16 hours of pain relief, with 8 hours of therapy while worn and 8 hours of continued relief after removal. Designed for targeted relief, they feature patented heat cells for deep, penetrating heat that increases blood flow and oxygen to damaged tissues, helping to relax tight muscles and restore aching muscles. The discreet pads are worn under clothing and are one size fits all.