I got these a while back, but I don't get to camp out as much as I used to. They work whether you're on land or in the sea (with a life jacket on).The website does a great job explaining the product.
http://www.land-shark.com/Land-Sea-Main.htm

On the wrapper containing each survival blanket there is an Expiration Date, but the ink is worn off, each blanket remains in its original vacuum sealed cover. There is absolutely no damage to either bag or carrying case. It's a much needed addittion to any survival pack.


They cost about $70 each from the manufacturer. I’ll let the pair go for $90 plus shipping.