THERMACARE MENSTRUAL PAIN THERAPY HEATWRAPS: send real heat deep into your muscles to relax contractions and provide period pain relief.PATENTED HEAT CELLS: Delivers heat deep into the tissue to relax, soothe, and unlock tight muscles right at the source, to relieve pain and accelerate healing.THERMACARE PERIOD PAIN RELIEF HEATWRAPS: are air activated providing up to 8 hours of pain relief by increasing blood flow and oxygen to accelerate healing and relieve pain.THIN & DESCREET: ThermaCare Period Pain Relief Heatwraps easily fit under clothing without being noticed. Move freely with proven therapeutic heat without cords, outlets or batteries.HOW TO USE: Place the ThermaCare heatwrap below your belly button with the adhesive side against your undergarments. Adjust the heatwrap and press firmly to the heatwrap into place.