Thermal metallised heat reflective bag that provides entire body coverage for maximum personal protection, and reflects and retains over 90% of radiated body heat (NB radiated body heat is only a tiny fraction of overall body heat). Thermally welded & taped seams. A good lightweight alternative to the traditional orange plastic bag. When taken out of its cardboard box, it remains sealed in a small plastic bag for easy storage in a rucksack. Can also be used as a cheap vapour barrier liner. Totally waterproof and totally non-breathable!