Bramble - 40 Natural Air-Activated Adhesive Body Warmers - Lasts up to 8 Hours

I'm on my 3rd order of these body warmers and they work much better than they say. I've been having them get, and stay warm for 10-14 hours. Not burning hot, but a good solid in your bones warm, and through a t-shirt on my belt line, they help keep my bad back from stopping me before I get started on cold day, I'm really from Florida so 50 Deg. and lower is cold to me. They stay in place very well and about the only thing that makes them fall off is if you sweat or get them wet. They do say right on the packaging not to put them directly on your skin, and they mean it, you will get blisters if you do it, so read the instructions and use them correctly, and you'll be loving the warm keeping you going.

I work on an expedition cruise ship as a guide in the Arctic and Antarctic and will regularly spend 3-5 hours at a time outside in freezing temperatures. On cold days I love to stick one of these to my lower back (to my base layer, not my skin!) before I go outside. I feel like having one in my core area helps my whole body feel warmer, and placing it on my back keeps my muscles looser when I'm tensing up from the cold. Usually one will last me all day if I keep it under another layer, they run out faster the more air they're exposed to. These are a simple and easy way to keep warmer in cold weather!

They don’t heat up as much as other brands I have used.

Fantastic! I especially love the sticky back, this allows me to stick it in my hat so it can press against my neck (cancer) in the PERFECT SPOT if it's a bit too warm, I can just put a square or 2 of toilet paper over it until the temp is just right! Ideal for people going through chronic pain localized in an area that is just a one or a few square inches.

These work great to keep hands and body warm in the cold.

Tried 15 of them and most did not heat, the ones that did took about 3-4 hours to give off any heat and barely warmed up when they did. I tried a few as I would any other heating pads, tried airing a few out, tried shaking them around in the air, hiked for several hours and nothing seemed to get them to work well. Definitely don't want to go camping or hiking in the cold expecting these to work and then just being cold the entire time.

These would not warm up without body heat. They say not to apply directly to the skin, but that was the only way they would get warm. Took a very long time as well. Weren’t right for our needs.

While they may take a little longer than stated to heat up, they last a good long time and put out a really nice amount of heat.Like the adhesive backing so you can slap it onto your clothing without needing something to keep it in place.All in all I consider these a great buy!