The Quantum Jacket is the epitome of all-weather performance, with a tough, waterproof, and breathable Surface 3-layer exterior. But it’s not just about the weather protection – the Quantum is designed to adapt to any temperature, easily layering up or down to find your perfect comfort zone. And when it comes to storage and mobility, this jacket has you covered, with asymmetrical chest zippers that stay accessible even with a backpack, plus intentionally-placed style lines that move seamlessly with you on both the ascent and descent.