PrimaCare PHP-45 Instant Heat Pack for Emergency Heat Therapy, 4" x 5", Pack of 24

These little packs get super hot so the sleeve provided is necessary. Even with the sleeve, it's still a lil too hot. Need them after UFE procedure and it really helps with cramping. Not sure how long the heat lasts since I just started.

I got this because I wanted to use it to relieve my menstrual cramps. First, the size was misrepresented because I thought it was bigger. Most importantly, it was extremely difficult to pop and activate the heat pack. I squeezed for a long time and was only able to pop 2. I had to order a different one even though I had about 20 unused packs left. Definitely a waste of my money!

Simple first comment: THIS IS A NO BUY RECOMMENDATION! Let me explain why you should keep looking for other solutions. First, they are almost impossible to activate, as many reviews already mentioned. Pack says squeeze here to activate, nope doesn’t work. I had to take a heavy bottle to pound on the pack to activate it. Why should it be so difficult? Second, I needed a pack for me irritated eye. Dr told me not like a barber’s towel but not so cool you don’t even feel it. Well, after the tough chore of activating it, the middle of the pack was 104 degrees. Sounds great right? No way, it’s just slightly warm affording no real heat to my eye. There are other self heating packs like hand warmers, but NO, they get way too hot for your face and can cause burns! So, my questions moving onward, attempting to fund a viable solution. Trying microwave packs next, but like many of us, I don’t want to leave the bedroom to go to the kitchen to heat up a pack. I want to be in bed, open one and use it immediately. As I said, I’m searching to find a more viable solution for more of you are not disappointed like I was. Will update my review when I’ve located a good product that meets my needs!

I had to change my whole review once I understood how the hot pack is activated. Based on other reviews, I too thought the hot pack just doesn’t activate properly. However, after trying different ways to pop the inner bag, I found: that is not true. Actually, they all work fine. First, I get it. The packaging of the product is so to keep it from an accidental rupture of the inner bag. So, yes it may be a little difficult to rupture the inner pouch but I believe it was designed that way. Second, these are small hot packs. They are very temporary and get extremely hot. I would encourage wrapping in a dry washcloth or some other protective wrap to avoid that first burst of extreme heat-especially if you’re sensitive. Lastly, each hot pack comes with a white sleeve to assist in protecting your skin, but they are very, very thin/lightweight and do not provide a lot of protection. I found that after I wrapped the sleeved hot pack in my washcloth, I was able to use and it was effective and worked consistently for about 30mins.

Good when working but beware that some will arrive already activated and dead! I counted about 8 packs that were already dead! Some (about 2) could not be used for some reason. No matter how we tried to activate the chemical reaction, it was a no go situation. I was happy with the remaining! The working ones were very good in duration and light to carry! Would order again but the failures give me reason to find another vendor or maker. I cannot offer a solution in the premature activation due to the many factors in delivery methods! This item is activated by squeezing or some impact slapping method and that action comes with the normal action within deliveries! Better packing? I do not know! Again, they work and produce heat for a good duration! Thanks Amazon!

I took off one star for the small size and another star for the duration of time they stay hot. I was expecting the heat to last a couple of hours like most hand warmers and other heat therapy products I've used. These seem to maintain heat for about 30 minutes.

Product good. Packaging at plant sucks. Smaller box packed first and crushed under weight of bigger box.

Work good

Nice little package of heat when you need it

No sirven no calientan

It's helpful when you travel

I carry these because I am extreme back problems which I wear a support belt for, and these packs I use to stop the spasms when they start, but most of these packs will not heat up, in fact less than half I have tried so far work, which is really upsetting.

They work well but they are small not broken bags would purchase again