The tester, in my opinion did not test the vest as stand-alone survival garment and changed the parameters by placing his coat over the vest. If used in combination with an over-garment, then yes it should increase the insulation value of either the vest or coat by itself. I would like to see if he still felt it worked without his overcoat. It is unclear to me what “I hung around in the woods for awhile” means in terms of real time and would like to see a timed study with thermal imaging and/or temperature probes while standing, sitting or laying around for a significant period of time (spend the night out), as one might encounter during a real survival situation. This product may in fact work and be a valuable asset; I just do not see the testing/data to support the claims.

Pete