The Katabatic Gear Pinon Bivy provides insect, wind and rain spray protection while camping in a tarp or floorless shelter. It’s made with a non-waterproof but water-resistant top, so it’s best used in combination with another overhead shelter, rather than as a standalone bivy sack. Having a water-resistant upper rather than a waterproof upper means that it’s much more breathable than waterproof bivy sacks, which means less condensation.