Arc'teryx's lightest Atom jacket is the ideal companion for changing summer weather. With its compact and lightweight design, you'll want to keep it with you at all times. This jacket features strategically placed Coreloft insulation at the chest and back, ensuring both efficiency and lightweight warmth. The Tyono 20 outer shell strikes a perfect balance between allowing airflow and providing wind resistance, complete with a DWR finish that repels moisture. Ventilation is taken care of by stretch fleece side panels, and an uninsulated hood offers additional coverage while conveniently buttoning out of the way when not needed. Recent updates to the design include a new fabric package and a button for stowing the hood when it's not in use. Mens Atom SL Hoody