The Rab Men's Firewall Mountain Jacket is a light, packable rain jacket designed for backpacking and mountaineering beyond the treeline when the weather is more unpredictable. Its Pertex Shield 3L construction includes remarkably high waterproof and breathability ratings, and the 100% recycled material is thin and packable for stashing away when it's sunny out. A regular fit enables easy layering at a moment's notice, and Rab articulated the sleeves for freedom of movement. Adjustments along the hood, hem, and cuffs secure coverage from storms, and YKK Aquaguard zippers add watertight coverage to the front closure, ventilators, and pockets.