The SnugpakA(R) Bivy Bag puts another layer of windproof, waterproof protection between you and your camping environment. Increase the capabilities of your favorite sleeping bag. Be ready for emergencies on the trail. SnugpakA(R) is a long-standing supplier of government and defense contracts. A well-earned reputation for quality has led to its products being used across every inhabited continent. Breathable Paratex Dry waterproof membrane 5,000mm hydrostatic head water-repellent capability 35" x 91"l., packs down to 5" x 4" diam.