The reflective surface of the Emergency Rescue Blanket serves multiple purposes, one of which is to help individuals signal for rescue in emergency situations. The reflective properties of the Mylar material make the blanket highly visible, especially in low light or when viewed from a distance. By waving or positioning the blanket in a conspicuous manner, individuals can increase their chances of being spotted by search and rescue teams or passing aircraft. Additionally, the reflective surface helps retain body heat by reflecting infrared radiation back towards the body, enhancing the blanket's insulation properties and helping individuals stay warm in cold conditions.
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https://www.chinabandages.com/first-aid-accessories/emergency-rescue-blanket.html