The SOL Emergency Bivouac Bag, be prepared for unexpected situations. The Bivouac Bag is completely waterproof and windproof, the specially formulated material reflects up to 90% of all your body heat. This allows you to keep yourself warm and dry in the most dire of conditions. The bivouac is available in signal orange for when you want to stand out and OD Green for when blending in with the surroundings is important. The Bivouac features a rescue whistle, which you can use to make yourself audible. The core of the cord that closes the bag is made of water-resistant cotton tinder, this fiber-rich material is easily ignited with a flame or spark.