The Rab Xenair Jacket is a lightweight, highly breathable, lightly insulated layer that's ideal for changeable conditions It's the perfect outer jacket on light and fast hikes or as a hard working midlayer in winter conditions. Adaptable, warm, and versatile, the Xenair Jacket is a dual density synthetic insulated jacket that excels in mixed conditions and start stop activities. Featuring a highly breathable, weather resistant Pertex® Quantum Air outer and two weights of recycled PrimaLoft® Gold Active+ insulation, it has been engineered to hold warmth when you’re static and allow airflow as soon as output increases. Strategically body mapping the different densities of insulation the jacket efficiently balances body temperature and eliminates the need to constantly change layers. Xenair Jacket - Men's Synthetic Insulation