Outdoor Research Alpine Bivy The Outdoor Research Alpine Bivy is a great way to spend your camping nights outdoors. It is made with a 3-Layer Gore-Tex Respiration Positive fabric that is waterproof, windproof, and comes with fully taped seams for largest water repellency. A Hydroseal coated nylon floor gives you long-lasting durability you can rely on. Its high-volume foot section is designed to give you a more natural leg place for easy movements while you sleep. The single shockcorded Delrin pole helps the bivy stay up and away from your face for undisturbed sleep. There is a 100% Nylon No-See-Um mesh to keep bugs and critters away, while providing the bivy with excellent ventilation. It is also lightweight (32 oz.) and easy to carry on all your trips and vacations. The Outdoor Research Alpine Bivy is a great way to camp out.