12 hour reliefcontinuous warming reliefnon medicinal amp ready to useair activated heat pack for targeted reliefcura heat provides targeted temporary 12 hour warming relief from minor muscular and joint aches and pains just open the sachet and apply to clothing underwear where the heat radiates through to the source of pain increasing circulation decreasing stiffness and relaxing sore musclesfragrance free non medicinal and with a thin discreet