What Our Gearhead(R) Experts Are Saying:"I've used this jacket on long alpine pushes where I'm constantly moving in cold air. The Polartec Alpha insulation breathes incredibly well, so I don't overheat, and the Pertex Quantum Air shell blocks wind without feeling stiff. It's light, packs down easily, and is my go-to for high-output winter climbs."We thrive in the mountains when our gear works as hard as we do, and the Mammut Eiger Nordwand IN Flex Air Hooded Jacket keeps us comfortable through shifting alpine conditions. With a Pertex Quantum Air recycled nylon shell, it shields us from biting wind while letting heat and moisture escape during strenuous movement. Inside, Polartec Alpha Direct insulation offers warmth that never feels stuffy, making it perfect for stop-and-go missions in cold weather. This jacket's climbing-specific patterning keeps our movements unrestricted on steep ice and technical rock, while the PFC-free DWR sheds light snow and moisture. Lightweight, compressible, and ready for the harshest vertical terrain, it's the piece we grab for demanding ascents where breathability and mobility matter just as much as warmth.