SALEWA PTX BIVIBAG II is a waterproof bivouac sack, ideal for alpine-style mountaineering or emergency situations. The PTX Bivybag II is a two-person technical, waterproof bivy bag for planned bivies. Made of waterproof Ripstop nylon it has heat-sealed seams for weather protection and breathable Powertex fabric on the topside for reduced condensation. The hood features practical cord for attachment to branches or the rock face. Also comes with an emergency whistle.