Description of Outdoor Research Advanced Bivy This spacious bivy can be used in place of a single tent. It is larger than the Alpine, with more space for thicker sleeping pads and loftier bags. The patented dual-pole system can be used for increased ventilation and interior space, or left behind when weight and pack space are critical. The Gore-Tex® Respiration Positive™ fabric allows warm moist air to escape to avoid condensation while providing supreme weather protection. A zippered vent at the base improves airflow on humid nights. Features: Waterproof/breathable 3-layer Gore-Tex® Respiration Positive™ fabric Durable Hydroseal® coated waterproof nylon floor Fully taped seams Two shock-corded Delrin poles, overhead and circumferential (Dual Delrin pole system pat. #4,458,145) Removable no-see-um netting covers opening End-opening zipper with wide storm flap Sleeping pad straps (pat. #5,941,264) Sized to fit thicker mats like the Exped DownMat™ 7 Five stake loops, three guy line loops High-volume foot section with zippered vent Small internal mesh pocket Avg. weight: 39.0 oz./1106 g Avg. weight w/o poles: 34.0 oz./964 g Length: 87 in. / 221 cm Peak height: 20 in. / 50 cm Height at feet: 14.5 in. / 37 cm Width at shoulders: 26 in. / 66 cm Width at feet: 19 in. / 49 cm