Ultra-lightweight metallized polyethylene (Mylar) blanket that reflects up to 90% of radiated body heat back to the wearer​:contentReference[oaicite:87]{index=87}. Waterproof and windproof, it provides an effective barrier against the elements in shock or hypothermia situations​:contentReference[oaicite:88]{index=88}. Standard size ~210 cm × 130 cm, packed folded in a palm-sized packet. The blanket is tear-resistant and does not shred easily if nicked. Often colored silver on one side and high-visibility orange or gold on the other for signaling. Essential for emergency kits and first aid to prevent heat loss.