Gamma lightweight jacket for various terrain, conditions and activities on warm days. The lightest model of the Gamma Jacket is a must have soft shell for anyone who wants to enjoy the outdoors for a long time. Made from recycled nylon, the Fortius 1.0 softshell is stretchy, breathable, and has UPF 50+ sun protection. Regular fit with room for light layering, and finished with a pattern for freedom of movement.