From weekend backpacking trips to early-season mountaineering missions, the Rab Women's Cirrus Flex 2.0 Jacket expertly balances lightweight warmth and breathability. This puffy is stuffed with Primaloft Silver synthetic insulation, which effectively traps body heat even when wet. But what really sets the Cirrus Flex 2.0 apart from your average insulated jacket are two stretchy fleece panels on either side that allow excess heat to escape—preventing you from overheating when you're working hard. Finished with a highly durable weather-resistant outer fabric, the Cirrus will be your go-to for fast-paced mountain missions.