The SOL Heatsheets® survival blanket from Adventure Medical is constructed from vacuum-metalized polyethylene, which reflects 90% of your body heat. It opens easily and will not shred if nicked or punctured, and it can be easily repaired. The material is quiet and won't crinkle in high winds, and its high-visibility orange exterior makes you stand out clearly. Plus, survival tips and techniques are printed directly on the blanket.