[vestibule] 75D polyester taffeta Imported Extra-large pole supported front vestibule provides extra space and a covered entrance. Vestibule area = 43.4 sq. ft. Dual sliders and storm flaps on door zippers allow for ventilation while keeping inclement weather out. Awning-style doors can be rolled up and secured for easy access, or extended using extra guylines or accessory poles (sold separately) Multiple buckles make integrating vestibule simple and secure. Includes 6 x 7.5” Dirt Dagger UL stakes. Polyester taffeta with 1500mm polyurethane coating and a water-repellent finish without intentionally added PFAS Compatible with Big House 4 (2025 and 2023 models) Add this optional vestibule to your Big House 4 convert it from a simple structure to a cavernous escape from the sun or an unexpected change in weather. This extra-large, pole-supported vestibule is convenient for those trips when you need more space for camp chairs, bikes, dogs and all the extras - grab it when you need the room and leave it at home when you don't.