The emergency thermal insulation blanket is made of insulation mylar material, for those who gets caught out in the wild. It can help retain 80% of bady heat, meanwhile the mylar materail provides good sunlight reflection, means a lot for rescue.  Pocket friendly size 4"×1"×3", open size 83"×51"/55"/59"/63". It also works well on many other occasions, welcome for customized logo.