Arc'teryx equipped the Men's Alpha AR Jacket with lightweight protective features for climbers and alpinists. Its fully taped, 3 layer Gore Tex Pro shell gives this jacket guaranteed waterproof breathable protection while still weighing under a pound. Arc'teryx also designed the Alpha AR with WaterTight underarm zippers for ventilation and a helmet compatible StormHood for secure coverage from bad weather. An athletic fit makes the Alpha AR Jacket slim for bulk free comfort, and an e3D design ensures a full range of motion that keeps the jacket in place. Removable Hemlock inserts secure the jacket's waist under your harness, and the zippered chest pockets are always accessible even with a backpack on. The laminated internal pocket protects your phone from weather and scratches.