Insulated, mid layer jacket with wind and moisture resistant outer face fabric; ideal as a layering piece for cold weather activities. Atom Series: Synthetic insulated mid layers | LT: Lightweight.Atom LT Jacket This trim hybrid jacket is designed as an active-use insulation layer, providing vital core warmth with liberal mobility and breathability. Lightweight and compressible, the Atom LT Jacket features Coreloft™ insulation in the torso and arms. The side panels and underarms feature smooth faced, air permeable fleece stretch for ventilation. A wind and moisture resistant outer shell extends stand-alone usability. ESSENTIAL PIECE Fact: Every person at Head Office owns at least one Atom LT; most of the women have two. The reason: Coreloft™ 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. In light precipitation, the Atom LT can be worn as an outer layer. 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™ 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. A quick shake restores the original loft, time and again.