Originally developed for NASA. The MPA Space All Weather Blanket pound for pound is warmer than wool. It retains 80% of radiated body heat, preventing hypothermia and providing unsurpassed protection in sub-zero temperatures. Use as shelter, prevent hypothermia, ground cover...Precise vacuum deposition of pure aluminumReinforcing fabricLayer of colored polyethylene filmDimensions 60"(152 cm) x 84"(214cm)Weight 12 ounces (340 g)