I brought some as I suffer from bad cramps at that time of the month and thought hey neat what a great idea.
I found they looked like a over size tea bag and placed it on myself were needed as per instructions I found by the end of one hour it had not heated that much at all and did not provide any relief and it also did not stick very well.
I will not be buying or using these ever again I feel they are a waste of money and the good old wheat pack does a better job.
I had a sample of this product sent to me so I tried it out one day when I was having bad cramps. It took a while for the pad to heat up and when it did it wasn't overly warm. It was convenient to not have to carry a hot water bottle around but it wasn't as effective as one.
Tips: Wouldn't buy these but they were convenient.