Midol Heat Vibes Menstrual Pain Relief Heat Patches are single use period pain patches that use drug-free heat therapy to relieve minor menstrual cramp pain, promote blood flow and relax muscles. Heat Vibes pain patches provide up to 8 hour pain relief, with the therapeutic temperature helping to relieve pain from menstrual cramps, PMS pain and muscle aches. Convenient and easy to apply, these pain relief patches are individually wrapped and provide discreet comfort when you are on-the-go. This box contains three single use Midol Heat Vibes Menstrual Heat Patches. Use as directed.