The VSS Waterproof Bivi from Khyam is a breathable waterproof bivi bag that will keep you dry & comfortable The VSS Waterproof Bivi keeps moisture out while keeping while keeping condensation down while the rest of your chosen VSS System Bags are zipped together to keep you warm The VSS Waterproof Bivi is compact & lightweight making it easy to take with you on those outdoor adventures when the weather is challenging