Arc’teryx Atom SV Hoodie Black. The Arc’teryx Atom SV Hoody delivers reliable warmth and comfort in cold, damp, or windy conditions. Its synthetic insulation and StormHood™ help retain heat, while strategically placed side panels offer gentle breathability for all-day wear. Updated with a streamlined fit, PFAS-free DWR finish, and improved thermal patterning, it’s a versatile layer that works perfectly on its own or under a jacket, making it ideal for everyday winter wear.