Lightly insulated CoreloftTM Compact hooded jacket with air permeable side panels. Warm weather is never a constant, even in summer. Fog rolls in, a sudden thunderstorm blocks the sun, and changes in elevation and levels of exposure can cause temperatures to suddenly shift. But summer conditions seldom require bulky insulation. The Atom SL Hoody is specifically created to hit the zone where insulation is required, but in a measured amount that suits milder conditions. Providing warmth comparable to a lightweight fleece for significantly fewer grams, the Atom SL is an efficient midlayer in cool conditions and a great standalone during rest breaks, early morning starts, and while enjoying the view from a freshly bagged peak. FOCUSED VERSATILITY The Atom SL is designed to handle subtle climate shifts. Balancing air permeability with wind resistance, the shell material allows airflow during active periods, but helps cut the chill during static moments. 40gmA2 CoreloftTM Compact insulation is highly compressible, insulates if wet, and delivers its superior performance for very little weight. All the Atom SL's fabrics are selected to manage moisture and provide comfort while on the move. Sleeves are lined with a comfortable mesh, and lightweight fleece side panels help provide thermal performance and ventilation. Articulated sleeves and gusseted underarms extend freedom of movement. FUNCTIONAL MINIMALISM Arc'teryx designers know that a thoughtful minimalism delivers more performance. Created to be so compact and light there's no reason to leave it behind, the Atom SL employs only necessary features and ultralight fabrics. Comfortable, easily compacted and resilient, the TyonoTM 20 shell material uses fine denier yarns that allow a fabric configuration that is surprisingly strong for its weight. The DWR durable water repellant treated StormHoodTM hood is uninsulated, making it ideal for minimizing wind chill or providing protection in light rain. The trim fit minimizes bulk and layers easily, and the insulation is placed only where it's most needed, in the core, to reduce weight and bulk without sacrificing appropriate thermal performance. The result is a hoody that provides efficient shoulder season insulation, stuffs to the size of a grapefruit, and weighs a mere 260 grams. Developed by Arc'teryx, CoreloftTM is a synthetic insulation made of staple fibres in mixed sizes that are crimped to trap air and retain warmth. Available in different thicknesses for end use performance and comfort. Lightweight and highly compressible Durable and resilient Retains its warmth in humid and wet conditions and dries quickly if wet Technical Features Weather resistant Breathable Insulated Compressible and packable Ultralight Construction Arc'teryx Nu water repellent treatment Fleece stretch side panels allow for ventilation Mesh lined sleeves provide next to skin comfort Patterning Gusseted underarms Trim, slim fit, increases breathability during high output Hood Configuration Adjustable, low profile uninsulated StormHoodTM Zippers Fly Configuration No Slip ZipTM front zipper Full front zip with chin guard and wind flap Cuff Sleeves Configuration Shaped cuff with stretch fleece Hem Configuration Drop back hem Adjustable hem drawcord Pocket Configuration Two hand pockets with zippers MATERIALS Mesh 100% polyester TorrentTM 84% polyester 16% elastane. Moisture wicking, breathable, stretchy, jersey knit textile with a soft, brushed surface and a PolygieneAR finish to manage odour. TyonoTM 20 denier shell with DWR treatment 100% nylon CoreloftTM Compact 40 insulation 40 gmA2. 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. CARE Machine wash in cold water. Do not use fabric softener. Tumble dry on low heat. Do not iron.