It’s a special material that provides wind and water resistance along with good insulation, and they are extremely lightweight, cheap to manufacture, and can be stored easily as the 6ft by 4ft blankets are stored in 1x3x2in packets.
This combo makes them incredibly useful for survival kits and medical emergencies. they aren’t used in “normal” situations because they are single-use and easy to rip.
As for why everyone gets a blanket – staying warm when injured is extremely important, especially to people in shock (a common response to emergencies).
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