Thermarest tranquility 4 wing an open air shelter that also works with the tranquility 4 tent to add greater coverage and ventilation product details whether youre looking for a stand alone open air canopy for a summer river trip or you want to add more coverage and ventilation to your tranquility 4 tent the tranquility 4 wing literally has you covered this three point structured tarp system replaces the rainfly of the tranquility tent for greater ventilation and coverage or you can