Exped's Bivybag 100% EVent gives you full weather protection in a lightweight package. A good rain jacket shields you from the elements during the day, a Bivy Bag at night. Extremely lightweight, incredibly compact, and unbelievably versatile. This small handful of high tech fabric shields you from wind, dust, rain, and condensation. Made of waterproof and breathable eVent fabric on both top and bottom. The vapor permeability even allows you to dry wet clothes from within as your body heat forces vapor through the fabric. The perfect bivy bag for extreme adventures and for those that leave the sleeping mat outside. It features a roomy design and hook up loops on hood and foot box. The entry access seals by zipper and hook and loop tabs.