What Our Gearhead(R) Experts Are Saying:"This jacket is insanely warm for how little it weighs. At just over 400 grams, it compresses down to almost nothing in my pack, but the 900-fill Mammut Down lofts back instantly when I need it. I also love that Mammut added synthetic insulation in moisture-prone areas-smart design that keeps me warm even in damp alpine conditions."When we're tackling fast-and-light alpine pushes or chasing vertical objectives where every gram counts, the Mammut Eiger Nordwand Light Down IN Hooded Jacket is our trusted source of warmth. Built with responsibly sourced 900-fill Mammut Down, it delivers exceptional loft and compressibility, while strategically placed recycled synthetic insulation ensures performance in areas prone to moisture. The Pertex(R) Quantum ripstop shell is enhanced with Diamond Fuse technology for abrasion resistance, water resistance, and durability-all wrapped in a lightweight package that packs down effortlessly. A stitch-through construction balances warmth and packability, while a streamlined cut layers seamlessly under shells or harnesses. Finished with a PFC-free DWR and constructed from recycled materials, it's a high-performance alpine layer that doesn't compromise on responsibility.