For some reason I do not seem to get anywhere close to 10 hours of heat. I have been using these for my gloves for skiing. Often they seem to go dead within four hours. They also do not seem to get as warm as many hand warmers I have used.

These are great, but tend to cool down too fast. When skiing or snowboarding it is very cold outside, and taking off the glove to "refresh" (shake and expose to air) the warmer isn't easy. Moreover, this "refreshing" doesn't keep it warm for long enough. I think that these warmers are a must-have when skiing or boarding, and should be in everyone's gloves, but note that although your hands won't be cold, they also won't be warm. Cheers.

Not a bad product but not as good as Grabber brand. These do not get as warm nor last as long as Grabber products. For the price they are fine for short period of use. If you want/need warmers that last for more than three hours this should not be your choice.

I have been using handwarmers for years while skiing. I decided to switch to this cheaper brand. DON'T! They do not work. I called the company-they shipped me a new box-they don't work either! Don't waste your $!

I have cold hands and feet all the time. I bought some of these hot pads and they are great. When watching TV in the evening I put one of the hot pads between my sock and slipper and my feet are toasty warm. They are warm enough in the morning to put in my pocket to keep my hands warm until it warms up.