A thermal blanket is a very useful piece of survival equipment. They can be found in most first aid kits and are a great addition to any emergency or disaster kit. Go here https://www.californiadesignden.com/products/all-season-thermal-blanket-white-twin-twin-xl
A Thermal Blanket is a thin sheet of heat-reflective plastic, which helps to reduce body heat loss by reducing the rate at which sweat evaporates and by reflecting the sun’s rays. It is less bulky and more lightweight than a non-thermal blanket, which is made from many layers of thick cloth.
Often referred to as a solar blanket or mylar blanket, thermal blankets are used in emergencies and disasters. They can assist in preventing shock in victims and provide warmth (retains and reflects up to 80-90% of body heat).
Stay Warm and Toasty: A Comprehensive Guide to Thermal Blankets
When they are not in use, these can be folded and carried in a compact bag to ensure that they are always available for use when required. These are also used in hospitals and medical practices to help patients retain their heat more effectively, which can save them lives.
The NASA spacecraft Cassini has a layer of finely sewn, super-strong, extremely lightweight fabrics on its shields that protect it from the extreme heat and cold of deep space. The fabric consists of several layers of materials, including aluminized Kapton and mylar that were specially designed to stand up to the radiation environment in space. In addition to protecting the spacecraft from extreme heat, it also provides protection against micrometeoroid dust grains that litter the surface of space.