Summer weather is warm, until it isn’t. So compact and light, there is no reason to leave it behind, Arc'teryxs Atom Sl Hoody Men's 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\n\nMaterialsTyono™ 20, 100% nylonbluesign® Approved Stretch Fleece Side Panel - 93% Polyester, 7% ElastanePermair™ 20, 100% nylon lining (select colours)Dope Permair™ 20 - 100% nylon lining Coreloft™ Compact 40 insulation (40 g/m²). Highly crimped, multi-denier siliconized polyester yarn that has undergone a special process which reduces the thickness of the material by 50%, without reducing its insulation value by the same amount. Lightweight, breathable, thermally efficient 100% polyester fibre. Arc'teryx Men's Atom Sl Hoody Helios | Buy Arc'teryx Men's Atom Sl Hoody Helios here | Outnorth