Disappointing, not enough heat

I received a free sample of Midol Heat-Vibes from SoPost and ProductSamples to try in exchange for my honest opinion. I was excited to try this Midol Heat-Vibes patch because I often experience lower back pain. However, I was disappointed to find that it did not provide enough heat to relieve my pain. The patch is cute, small and thin, easy to apply to clothing and remove. It starts to heat up immediately after application, but the heat level is not very strong. I wore the patch for the maximum recommended time of 8 hours, but it did not relieve my pain. I would not recommend it to anyone who is looking for a strong heat patch to relieve pain.