I was quite surprised at just how much heat and for how long these pump out. The warmth really does last for hours. Works best for the above hip area, although they are adjustable with a very lightweight velcro attachment. They are less useful for areas much above the hips because they will tend to slide down. Men might find this less of an issue.They are also the size written on the box. Average and smaller women should use a size smaller. All in all a nicely designed product."

after 7 days of product use the pain you are treating gets worse or remains unchanged. This could be a sign of a more serious condition. Ask a doctor before use if you have diabetes, poor circulation, rheumatoid arthritis or are pregnant. It is normal to experience temporary skin redness after removing the wrap. If your skin is still red after a few hours, stop using ThermaCare until the redness goes away completely. On my bad period days, no Advil or Tylenol helps...only heat. I can wear these to bed and to work and no one knows about it. I've been using these for years and they work better than ever still." you experience any discomfort, swelling, rash or other changes in your skin that persist where the wrap is worn.This is a great product for menstrual pain. It's so much better than having to carry an electric heating pad to work, and it really does stay warm for eight hours!"