Mammut lightest, most packable 3-layer hardshell. Designed for fast-paced activities like trail running, this featherweight champion is fully wind- and waterproof and breathes even heavier than you do on those tough alpine sprints. With minimal seams, a dash of reflectivity, and a snug-fitting, pre-adjusted hood that won’t hinder your view, this is one piece of gear you won’t be leaving home without.