When you're in an emergency situation, it's important to stay warm. This Emergency Blanket is made of lightweight Mylar material that reflects 90% of body heat back toward the user while protecting against wind and rain for up to 12 hours at a time. They fold up into the size of a small cell phone so they can be easily stored in your pocket or backpack for emergencies. With this emergency sleeping bag, you can keep warm and safe from the elements until help can find you.