What Our Gearhead® Experts Are Saying:"When it’s cold enough to see your breath and you’re stuck waiting out the wind, the MTN-X Echo Down Jacket is the one I reach for. It’s warm, packs surprisingly well, and the Pertex shell feels tough enough to handle camp chores or loading gear in sharp snow. It’s a cozy beast."At basecamp, warmth is more than comfort—it’s survival. The MTN-X Echo Down Jacket is built for that kind of cold, offering dependable insulation wrapped in a durable, technical shell. Whether we’re waiting out whiteout conditions or boiling water at sunrise, this jacket keeps us warm, dry, and ready for what’s next. The shell is made with Pertex® Quantum Diamond fused taffeta—an ultra-durable, windproof fabric crafted from 100% recycled nylon—treated with a water-repellent coating for added weather protection. Its high-loft construction retains serious heat without adding bulk, while thoughtful touches like a helmet-compatible hood and fog-free placket make it ideal for everything from expedition prep to mountain town recovery.