Clip-in the Front Vestibule to completely seal off the SkyAir ULT and provide weather protection for your pack and gear. When utilized with the Mesh Liner and Flat Footprint the Front Vestibule completely turns the SkyAir ULT into a weatherproof shelter in an ultralight package. For the true minimalist hunter, this completes a set up that is unmatched on the mountain in weight and functionality.