With the red side facing out, the survival blanket captures the sun's infrared rays to warm up the rescue victim, while the silver side reflects 90% of their body heat.
In the event of extreme heat, you may want to prevent the body from heating up too much. In this case, put the red side against your body to let heat escape and the silver-colored side facing out to reflect the sun’s infrared rays. Remember to let some air through for ventilation.
Warning: do not use this survival blanket during a thunderstorm or near incandescent materials.
