The new version of the most versatile all around synthetic insulated jacket from Arc'teryx. A top pick for our Seattle Mountaineering Store for use underneath your rain shell in extreme wet weather when some customers will prefer a synthetic insulation layer.  Synthetic Coreloft™ insulation still retains the majority of its insulation value when wet.  This low-profile jacket is very lightweight and is designed to be worn as either a midlayer underneath a rain shell or as your outer layer.  Stretch fleece side panels increase breathability and provide a more low-profile fit when worn as a mid-layer underneath your outer storm shell or ski/snowboard shell.