The heat lasts quite a while, and the sticker always comes off perfectly from the paper it comes with, which I consider very important. What needs improvement, in my opinion, is the shape. It would be much better if it were larger and rectangular to cover a bigger area, like a competing company does, which has a big problem with the sticker and you can't get it off the paper at all.

I was using it for 2 years now but lately they seem to have changed the packaging and the product itself. It got smaller and thinner and doesn’t work like it did anymore. Still at the same price too…not buying again unfortunately

It's amazing! I have a really hard time during my period, so it's lifesaving at work. Just, since it takes about ten minutes to heat up, it's good to put it on as soon as you wake up so that it's already warm when you leave the house. It definitely keeps warm for 8 hours. Truly my favorite!

Very helpful for period pains, just because I've been taking it for years, I've noticed that lately it isn't as effective! The heat production has decreased

I can't live without these, especially during the first days of my period! Each one can maintain temperature for a whole day. Suitable temperature and relief!

It does what it promises. Neither less nor more. If localized heat is something that helps you, then it definitely does the job, especially when using a heating pad is not feasible. It requires a little vigorous shaking to activate it properly, but it does indeed last for many hours. Especially if you press it and slightly feel it more. Now I use them every month as an extra relief.

At first, I thought it didn't work and I went to see the comments. Indeed, after a while, I didn't see any difference, so I thought maybe I got a bad batch and just left it stuck until it started to warm me up. I think it's a lifesaver because before this, I used a heating pad with a membrane