The Light and Dry Bivi Bag is an emergancy sleeping bag perfect for mountaineering.Whether you are hiking, mountaineering or competing in adventure races the emergency bivvy bag is a vital part of your kit. It is big enough to cover your entire body and is waterproof and windproof to protect you from the elements. It reflects and retains your body heat keeping you warm and dry. It folds down small and packs into its own stuff sack for convenient storage.