The NGT Over Wrap for the 'Fortress with Hood' bivvy is essential for the colder weather. The overwrap provides an outer skin, adding a layer of air insulation and preventing condensation inside the bivvy. The Over Wrap has a mesh/clear vinyl window in the door and comes with 12 pegs and a carrying bag. Please note: This for the fortress with hood (not the standard version without the hood) and is for the overwrap only and not a complete tent.