Pros: VERY effective warming device, pretty durable
Cons: Price, deployment
"I bought one of these to use for a survival class where we had to sleep in makeshift shelters for 3 days and I was VERY impressed. I have used the mylar "pop tart wrapper" devices before and have NEVER had a warm night in one...just a noisy one.
I also started using these on hypothermic patients before they got packaged into our litter package. The only complaint they had was that they were a little rough on the skin. However they also said that it started warming up VERY quickly after being placed in it.
May be more expensive than a mylar bag but WAY more effective and it can actually be reused a few times."
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