The Expedition Salopettes by Rab are down filled salpoettes, with a Pertex® Endurance outer, making them perfect for expeditions in cold harsh weather. The Pertex® Endurance outer helps to guard against moisture from light showers, or spindrift, helping to maintain the down's loft & warmth. The Salopettes can be worn in conjunction with the Expedition Jacket, giving an extremely warm & versatile suit.