PrimacarePHP-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.

Super recomendados te alivian el dolor...yo me lo pongo donde me duele me recuesto y me relajo y lo caliente me hace sentir alivio y trae bolsitas para que no te queme directo está super la verdad...cuando tenga menos los volveré a comprar.

i was cheated out of my money They sent three boxes, i returned two, and they only credited me for one They don't last more than a couple of seconds anyway

I like the heat packs. It’s a good size and gets really hot. Definitely recommend using the sleeves provided. My only complaint is it doesn’t stay hot long enough! Other than that it has served me well and a great value for the price.

Half of these packs cannot be popped so they won't heat up. The ones that do heat up get very hot very fast - almost too hot, but they do not last long - maybe 30 minutes at most. Not quite what I was hoping for.

Great product exactly as advertised.

Squeeze the bag together and listen for the “pop” then shake vigorously. They warm up in seconds and last about 20 mins. I use these in my clinic to help draw blood. Apply these to the skin or a minute or two with the mesh jacket that comes with them and vein pops up nicely, making my job so much easier! They have many other uses too!

Worked very well as a hot pack.