some are junk but there must be a few good ones out there.someone with a few bucks to toss out could buy all the brands for a show and tell.i know the 99 cent i got and was going to use as a rain cover for a shelter came apart when i opened it up.in the "how we made it" CD that comes with the Lord Of The Rings video they show the guy who was the Hobbit being wrapped up in a foil blanket after he falls in a marsh.he does not look too happy but the blanket that is being wrapped around him by a stage hand and another actor looks really big and heavy.