If you're forced to spend an unexpected night outdoors, the EMERGENCY BIVVY bivy sack will keep you warm and dry. This bivy sack reflects 90% of your body heat back to you, and protects you from wind, rain, and snow. Ultralight and compact, the EMERGENCY BIVVY is a great addition to the emergency gear you carry on hikes, bike rides, when camping, as well as in your car. This bivy sack is your best friend on a cold night out in the mountains while enjoying the stars. Made with tear-resistant, aluminum-coated polyethylene, it can be repaired if needed.