I founds these okay and great for if you experienced period pain whilst at work. They are discreet and do help with the pain.
They are not as good as a good old hot water bottle or wheat bag, but for discreetness out in public, I am quite happy with them.
They did come unstuck quite easily, but at the same time I would be hesitant to make them stickier (for allergy reasons). You just have to get it on the right place the first time! Do be aware I find if you use them more than twice in a row, you may have a reaction to the adhesive, as with what happened with me. Just give it a day or so in between uses so as to not irritate your skin!
The most important thing is that they helped - even if just a little bit! I mainly use them for sleeping - if I can get a restful nights sleep then I can conquer anything! Also note these are great for any other abdominal pain besides just period pain - eg. IBS episodes, stomache bugs or abdominal migraines can also benefit from these!
I love how convenient these are! I try keep a pack in my draw at work, as its so much easier than trying to use a hottie or wheat pack. These can take a little while to heat up sometimes, and other times they heat up pretty fast - I guess it depends on the batch. Of course a hottie or wheat pack is more effective as they are alot hotter, but for the mild days these do the trick.