Ultra-lightweight and warm bivy sack for emergencies. 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. Ultra-light 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.