An Emergency Bivvy that weighs only 3.8 oz.! This is an ideal bivvy for those occasions when you take a wrong turn and are forced to spend the night out. Carrying this is a great way to be prepared and, is now available with an ultralight stuff sack, allowing for repeat uses. Made from a newly developed polyethylene material that is vacuum-metallicized to reflect back 90% of your body heat. Compared to the competition, the Heatsheets Emergency Bivvy's material is significantly quieter, more durable, and also available in the AMK-SOL™ Survival Blanket. Size unfolded: 36" x 84". Size in Sack: 3.5" x 2.5".