Arcteryx Atom LT Hoody Jacket - Women's: Lightweight, breathable, insulated hoody; Ideal as a standalone piece in fair weather, or as a layering piece in cold conditions. Atom Series: Synthetic insulated mid layers | LT: Lightweight. ESSENTIAL PIECE Fact: Every person at Head Office owns at least one Atom LT; most of the women have two. The reason: Coreloft(TM) insulation inside a light taffeta shell. All the comfort of a sleeping bag, but it feels weightless. WINDSHELL The benefit of taffeta fabrics is their light, airy nature with an ability to turn aside wind. The Atom series have a taffeta outer lining that is treated with DWR (durable water resistant) finish to give them a long-lasting ability to shed moisture. DWR protects against light precipitation. NO SWEAT Mid layers that can function as outer layers have varied degrees of weather shedding capability; they also have varied degrees of moisture management. In addition to being made of breathable Coreloft(TM) insulation, the Atom LT has smooth faced, air permeable fleece stretch side panels to help regulate temperature during exertion. PACK LIGHT Highly compressible, Atom pieces pack down into a tiny parcel of stored warmth. Store the jacket inside its own pocket, or tuck it into a sleeve or inside the hood if you are not restricted by space. A quick shake restores the original loft, time and again.