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we tested using the silver colored space blankets against a couple of the handheld flir units. the 99 cent space blankets defeated the $6000 handheld flir units as long as you held the space blankets a couple inches away from your body. I was thinking of sewing one of the higher quality $10 space blankets onto my $30 gi issue poncho so that it is tactical and can defeat the flir.
I suppose if your operating in an area where PPL routinely wear space blankets this might be helpful as a general disguise but even if these blankets did not allow heat to pass through the net result is the wearer will have heat related distress rather soon and of course on a screen they would appear as a moving black object.