Activate in 1 minute* *The patch activates within 1 minute and will heat up within 5 minutes providing penetrating warmth for up to 8 hours. Up to 16 hours pain relief** **Once removed it can continue to provide pain relief for a further 8 hours. Heat therapy is well recognised and recommended by health care professionals for muscular pain and stiffness Long lasting, odourless, drug-free, warming pain relief to help get you through the day Dual Action Pain Relief Therapeutic heat from the patch helps reduce pain giving a targeted analgesic effect right where you need it Heat Therapy Penetrating heat helps relax stiff, sore, aching muscles & joints helping to restore movement Heat increases blood flow to the affected area providing oxygen and nutrients to aid the healing process Recommended for muscular pain, strains and joint stiffness. Can be used for back, hip, thigh, calf, arm, neck and shoulder pain.