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 received a sample of this from the libra website. I found that it didn't help my cramps I did however wear this when i was at work in winter last year and it kept my body really warm. I wouldn't buy this item due to a hot water bottle does a better job and is cheaper.