So compact and light, there is no reason to leave it behind, our lightest Atom is there for you when the temperature drops. Strategically placed at the chest and back, the Coreloft™ insulation is efficient, light, and compressible. The Tyono™ 20 outer balances airflow with wind resistance and has a DWR finish to repel moisture. Stretch fleece side panels ventilate and an uninsulated hood adds coverage and buttons out of the way when not in use. Moisture-wicking Breathable Compressible and packable Insulated Wind resistant Ultralight Fleece stretch side panels allow for ventilation Composite Mapping Technology strategically places each fabric for most effective protection and climate management Coreloft™ Compact 40 synthetic insulation in the core provides warmth Self: Tyono™ 20 denier shell with FC0 DWR treatment - 100% nylon bluesign® Approved Stretch Fleece Side Panel - 93% Polyester, 7% Elastane Lining: Dope Permeair™ 20D - 100% nylon - Dope Dyed, bluesign Approved Material (select colours)