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.

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!

All but a few were already activated and unable to use. Only a few st the very top were not activated

After reading some of the lower rated comments I grabbed a heat pack from the middle and the bottom, and just like others said, they DO NOT work. I am returning these asap! My original comment is below. I am absolutely disgusted about being ripped off! Go through the comments first before purchasing this product. (Original Comment) First these are more like 4 x 4, that aside, they are easy to activate (which is a plus for someone with RA) & they get really hot really quick. Heat lasted a good 20min’s before they started to cool down (constant/slowly). Please make sure you wrap them in a small towel before applying to your skin.

I have rolling, small veins that would wind up causing me to have a few puncture marks and/or bruises after having my blood drawn. Well, these heat packs are wonderful and have really helped the phlebotomist find my veins once I apply one to my arm before the blood draw. Yay!!🥳

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.

Gets super hot but takes a few minutes

Funciona perfecto

No sirven no calientan

It's helpful when you travel

Nice little package of heat when you need it

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.

Difficile a faire fonctionné.