The professional Panorama middle zipper sidewalls utilize our professional grade polyester and feature heavy-duty zippers on both sides for full watertight enclosure on any of our instant shelters. The clear viewing portion is a marine grade vinyl. All sidewalls attach with either the easy to use truss clips or our FXT system in a flash. Middle zipper professional grade sidewalls include a heavy duty zipper sewn right into the center of the wall to provide a point of entry/exit in fully enclosed shelter configurations.