Thermal space blankets, survival blanket,waterproof and windproof ,it retains up to 90% of your body heat. Perfect for First Aid Kit, bug out bags, go-bags, and home, auto emergency kits, each survival blanket is individually folded, wrapped, and sealed for easy storage and retrieval. They are reusable, providing you with multiple of warmth when necessary. Can also be used as a bivouac sack, backpack cover, rain poncho, emergency signal, shade cover, dust shield, arm sling, sleeping bag liner, wind blocker, water collector, trail marker·