A space blanket, also known as a thermal blanket or emergency blanket, is a lightweight, heat-reflective material designed to retain body heat. Made from a thin layer of Mylar, these blankets are often used in emergency situations to prevent hypothermia. They are compact and can easily fit in a backpack, making them popular for outdoor activities like hiking and camping. In addition to their use in emergencies, space blankets are also utilized in medical settings to keep patients warm during procedures. Their reflective properties help to maintain body temperature by reflecting up to 90% of radiated heat back to the body, making them an essential tool for both survival and comfort.