The Arc'teryx Women's Atom LT Jacket is a mid-layer jacket for cold weather hiking, climbing, and skiing. The Atom LT has been packed with 60 grams of Coreloft Insulation, a hydrophobic, synthetic material that resists moisture. The LT stands for lightweight, and coupled with a hip length and trim fit, it cuts down on bulk without sacrificing warmth or performance. Stretchy side panels courtesy of Polartec Power Stretch gives the jacket extra movement as well as breathability so you can stay comfortable on the trail and mountain all day long. The outer fabric resists abrasion as well as provides weather resistance due to the durable water-repellent finish. The internal pocket zips shut to secure a headlamp inside so the batteries won't get cold, and the hand pockets zip to hang onto a second set of glove liners. The Atom can also function as a stand alone and won't say no to a chilly afternoon in town after a hard morning on the slopes.