Forrest Mountaineering climbing / mountaineering Gore-Tex bivouac sac in very good condition. Zippered and Velcro closure for venting. Two-way zipper allows for staying tied-in while bivying on a route. Full length top is Gore-Tex and bottom is coated nylon. A small Gore-Tex repair patch and a few areas of nylon delamination inside which doesn't affect waterproofness as sac has been treated with Nik-Wax TX. Direct Gore-Tex Waterproofing so Bivy Sac is fully waterproof and breathable.