An emergency blanket, also known as a space blanket or thermal blanket, is a lightweight, compact sheet made from a thin layer of plastic that reflects body heat. Originally developed by NASA for space missions, these blankets are designed to retain warmth in emergency situations, making them essential for outdoor activities, survival kits, and first aid. These blankets are typically silver or gold in color, which helps to reflect heat back to the body. They are waterproof, windproof, and can be easily folded for storage. Emergency blankets are useful in various scenarios, including hiking, camping, and natural disasters.