The thermal bivy sack is durable and can be used for a long time. The sleeping bag is made of high-quality aluminum foil with coating, which is not easy to damage.Adding a blanket to the sleeping bag can improve the thermal insulation ability. Use a survival sleeping bag to keep you away from colds.The color of the thermal bivy sack makes it easier for rescuers to find it, and it is actually one of the survival equipment in the wild. The shelter bags are beautiful and practical.The survival bivy sack is suitable for use in field exploration, inspection, tourism, and disasters, such as earthquakes or other special situations.The survival shelter bag is compact and easy to store without taking up too much space. The survival bivy sack is lightweight and portable, so you can take it anywhere and use it.