The Arcteryx womens Atom Lt Vest for 2020 is a Coreloft insulated with air permeable side panels for mid-level output activities. This vest junctions as an outer layer or as a mid-layer depending on the conditions. The fit is a trim hip length and has a cute drop hem. The vest has a DWR finish to repel moisture and has Coreloft 60 insulation providing warmth. The collar is mid height and insulated giving added warmth and layers comfortably.