The Psiphon FL is for alpinists who want a light softshell that frees them to move fast in technical terrain. Employing Arc'teryx Hybrid Mapping technology to specifically place materials where they will deliver the greatest benefit, the Psiphon FL uses lightweight TerraTex softshell as its primary fabric, then reinforces key wear areas with durable, air permeable Fortius 1.0. TerraTex is ultralight, strong, and provides wind and weather resistance. It has a degree of stretch, and dries exceptionally quickly if wet. The Fortius 1.0 is used on the tops of the sleeves and shoulders to increase durability, enhance thermal management and add a higher level of performance stretch for extended mobility.