Specifically created to deliver protection, functionality and durability for minimal weight, the Psiphon FL is designed for alpinists who want to move fast. Arc'teryx Hybrid Mapping technology is employed to specifically place materials where they will deliver the greatest benefit. Lightweight TerraTex softshell serves as the primary fabric, then key wear areas are reinforced with hardwearing Fortius 1.0. TerraTex is ultralight, strong and balances wind and weather resistance. It has a degree of stretch, and dries exceptionally quickly if wet. Air permeable 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.