An uber lightweight and technical emergency shelter for survival situations out in the wilderness, the Arva Bivvy Pro is a great way to stay alive when things turn south. The lightweight construction makes it easy to stow away and keep in your pack while the ability to reflect body heat back in and keep you warm in the worst of situations. From being used as an overbag in high alpine situations to keeping a partner warm when waiting on a rescue, the Arva Bivvy Pro is a must have in your pack.