The updated Perch Double Expedition Fly has the ability to be deployed after the ledge is set up—so you can adapt when the weather takes a turn for the worse. A star-shaped design makes for easy set up. It is also designed to be unzipped during breaks in the storm and can be zipped on even while the ledge is hanging. A halo pole on the ledge provides more interior space and head room. Dynex grid fabric with strategic areas of reinforcement provides lightweight, abrasion-resistance protection from the elements.