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The material used in these heat insulating emergency blankets is said to have been developed by NASA, to be used as heat insulation during space expeditions. But it can be put to a lot of other good uses besides space travel. At the scene of a car accident, for instance, you can often see injured or shocked people wrapped in blankets like these to preserve their body temperature. In less serious situations, the blanket is very handy when camping, and it makes an excellent sleeping bag liner. Made from water proof, wind proof and highly reflective (90 percent of body heat is reflected) Mylar fiber, they have one more interesting feature. They are just USD 5:- for a 4-pack on Amazon.brbr