We might battle starvation, thirst, and exhaustion when we find ourselves in an emergency in the outdoors, but we certainly won't struggle with staying warm as long as we have the Heavy Duty Emergency Blanket with us. Made with windproof, waterproof Super Heatsheet material, this blanket reflects 90% of our body heat, and it's highly resistant to punctures and tears. It's large enough to wrap around the entire body, and it folds down small enough to fit into our pocket.