Survival mylar blanket are generally made of tin foil or aluminum film, and are divided into three types: double-sided gold, double-sided silver, and gold-silver double-sided. In the hot sun, wearing a first aid blanket over your body can protect your body from direct sunlight. Wrapping a first aid blanket around your body absorbs heat and reduces body heat loss during cold weather in the wild. In the event of a disaster in the wild, wrap the first aid blanket around your body to use its reflective effect to help rescuers find the target. The emergency blanket has good toughness, light weight, softness and strong plasticity, and can be used as a stretcher.