Lighter than the original, Arc'teryx's Atom SL Hoody is one of the most useful (and packable) pieces you can own. Wear it as a standalone layer when trail runs take you through cold, wet weather or layer it with a waterproof shell when mountain pursuits demand additional warmth and mobility. Breathable and weather-resistant, it has stretch insulation in the body but not the sleeves or hood — maximizing packability while still delivering focused warmth to your core. PRODUCT FEATURES: Versatile synthetic insulated mid layers with a high degree of weather resistance. Man-made insulation with quick dry times, durability and retains warmth when damp. Superlight materials and design, emphasizing lightweight and packability over durability. Moisture-resistant outer face fabric Breathable Lightweight Compressible and packable Durable Wind resistant Ultralight Fortius™ Air 20 face fabric effectively balances air permeability and weather resistance with lightweight durability and stretch Stretch synthetic insulation is breathable, warm, and light, adds freedom of movement, and is made with recycled content Lightweight stretch Octa® Fleece side panels provide freedom of movement and improve ventilation Insulation - recycled content Contrast - recycled content 240g / 8.5 oz Shell - bluesign® approved material Lining - bluesign® approved material Contains materials that meet the bluesign® criteria This article was treated with an anti-odour biocidal product (Polygiene) Fitted, with articulated patterning for mobility and comfort PFAS (Per- and polyfluoroalkyl substances) Compliant Two hand pockets with zippers Adjustable hem draw cord seals out drafts Adjustable, low profile uninsulated StormHood™ FC0 DWR (Durable Water Repellent) finish repels moisture and is PFAS-free Uninsulated, mesh lined sleeves give light protection and regulate temperature Produced in a Fair Trade Certified facility. Building worker well-being into product DNA.