Thermal blankets, also known as emergency blankets or space blankets, are lightweight, heat-reflective sheets made from a thin plastic material. They are designed to retain body heat, making them useful in emergency situations, outdoor activities, and survival kits. These blankets can help prevent hypothermia by reflecting up to 90% of a person's body heat back to them. Typically, thermal blankets are compact and easy to carry, making them ideal for camping, hiking, or any situation where warmth is needed. They are often used by first responders and in disaster relief efforts to provide immediate warmth to individuals in distress.