It’s not a very large patch but does heat up and does last for hours like advertised
These would be good for someone with very mild cramps who just needs that extra boost of comfort however I was still in a lot of discomfort as I have a very difficult during my cycle  time. They stick very well and do heat up just make sure to put in a spot that will remain flush against the skin. My only wish is that this patch was larger. Overall I would say it provides mild relief to cramps.
Rating: 3 stars