This item could be a real life saver in many adverse conditions. Keep one in your trunk if your car breaks down in cold weather, you will be grateful to have this lightweight and convenient emergency sleeping bag. It retains up to 90% of your radiant body heat. There is a draw string at the top to cover your body, and folds up to a compact size making it easy store anywhere. This light weight spaceage Mylar is also waterproof!