AMK SOL Emergency Bivvy The AMK SOL (Survive Outdoors Longer) Emergency Bivvy is made from the same heat-reflective polyethylene as Adventure Medical Kit's world-famous emergency blankets (reflecting 90 of your body heat back to you), with the added benefit of being fully sealed so that no wind, rain, or snow can get inside. If you're forced to spend the unexpected night outdoors, the SOL Emergency Bivvy will have your back. Features: Sealed on the sides for full protection from rain, wind, and snow Waterproof and windproof Heatsheets material Reflects 90 of radiated body heat Quiet, repairable material Recyclable Dimensions: 2.5 Diameter x 4 Length Packed volume: 0.3 Lite