I thought this might be a cool thing to invest in. They dont stay warm 8 hours but i dont think that would be a problem since you would have more on you. They look simple enough. Check them out. http://hotsnapz.com/index.html
Just read some reviews and they seem kinda mehhhh... I think the idea is good, just need a little more R&D.
I saw that video online this morning too. Was actually thinking about looking into them. Kristine goes through a ton of hand and feet warmers during the winter between hunting and ice fishing.
I had a set years ago. Early model of them I supose. They worked great for the first FEW uses. After that they would not stay "re-charged" (may not be ther right term but you get the idea) even overnight. Hopefully they have improved because they were pretty slick for a short time.
i had one years ago that I threw in my hand muff. It worked good enough while I was on stand. go home and recharge it for the afternoon hunt. It wouldn't last as long as the throw aways, but I liked it. It was not very flexible when activated if I recall right.
My old man bought some of those probably 20 years ago at the Deer & Turkey Expo in Madison - back when it was in the OLD round building next door to where it's at today. As others have said - they worked great the first couple times you used them. After a few uses and reactivations they didn't last very long at all. I just buy a case of Hot Hands each season and call it a day.
My son has 2 of them. He only used them a few times last year but they worked well and heated up fast.
I had a couple of those back in the day as well. They're pretty cool, but as other's have said they don't last as long as the disposable ones. The biggest problem is the inconvenience of having to boil them to "recharge" them after every use. It gets old. Still, it seems like it would be a good thing to have in your pack for a "just in case" situation where quick heat was required. They do heat up very fast.
Yeah that could be good use for them too. For the price though i dont think it would hurt to try them out for a season to see how they hold up.