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

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!

Not impressed at all. Not only is the quality poor, but it barely gets warm. “You get what you pay for” definitely applies here.

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!

It works great once you are able to pop it. A lot of them wouldn’t pop. But when it does it very hot and last very long. I also love that it comes with this pouch fabric so you won’t put it directly to your skin.

I got these for my father when he came home after surgery. Once I got the hang of popping the bags it wasn't so bad. The activator would move around in the bags so I would have to feel around for it since it didn't always line up with the arrows. When he would ask for a heat pad he'd always have me grab him two because they one only lasted 20-30 minutes.The size is a little bigger then the palm of your hand which wasn't an issue for us. Also we liked how they came with little sleeves you could put them in once you heated them up. When it heated up though it did get hot, just didn't last for long.Overall I think it depends on your needs for this product. If you don't mind the size & the short heat time then this would be great for you.

I work outside alot and wanted something to keep my upper torso warmer than just having on a jacket. Today it was 22 degree out and I placed 2 of these between my coat and t-shirt ( above my hips ) and they kept me nice and toasty for 4 hours before I noticed they were starting to cool off. Happy with my purchase and easy to use.

More than half of these packs are duds. The outer bag pops and the solution bag won’t pop and activate. These bags are Super hard to get to pop. No good for anyone with hand strength difficulties of Any kind. Horrible for the elderly to try to use. Avoid this brands product.

My mother was given a heat pack in the emergency room and it helped her arm so I thought I'd purchase some for her. These are AWFUL! So far, only 1, yes 1 of them has worked! We wasted our money on these!