The Gamma Sl Hoody Is The Result Of Years Of Arc’teryx Softshell Experience And Our Designers’ Extraordinary Focus On Purity Of Function. It Is A Pinnacle Piece Combining Advanced Performance And A Clean, Minimalist Aesthetic. The Fortius™ 1.0 Double Weave Is Light, But Strong. It Resists Wind And Water, Breathes, And Offers Four-way Stretch. A Stormhood™ Provides Protection Without Impacting Peripheral Vision, While The Trim Fit, Articulated Patterning And Clean Lines Keep It Streamlined And Comfortable.