Arc'teryx equipped the Men's Alpha AR Jacket to cater to climbers and alpinists alike. Its fully taped, 3-layer Gore-Tex Pro shell ensures waterproof protection and breathable performance, yet the jacket itself manages to weigh in under a pound.Just because the jacket is incredibly lightweight doesn't mean it's devoid of features that will enhance your experience in the harshest of conditions. Underarm vents allow you to take control of your temperature regulation while you're working hard in the mountains, while the helmet-compatible hood keeps you fully covered in case a storm blows in. The large hand pockets are situated high so as to not interfere with your harness or backpack's waistbelt, and the secure internal pocket is perfect for extra snacks or your phone. An athletic fit provides bulk-free comfort, and Arc'teryx's ergonomic patterning means that the jacket moves with you, allowing you to comfortably climb demanding ice pitches and set steep skin tracks.