Lightweight hardshell jacket for hiking Wherever your path takes you, with the lightweight and waterproof Alto Light HS you can go wherever you want. It combines reliable protection from the elements with a minimalist design - and is one of our lightest hiking jackets. The PCF-free 2.5-layer laminate with waterproof Mammut DRY Tour is made from recycled polyester. In terms of features, it has everything you need for hiking: hood, hem and cuffs, all adjustable in width, as well as zips for ventilation under the arms. What's more, the jacket is so compact that it can be stowed away in its own pocket. All this makes the Alto Light a must-have for small and large rounds.