A highly breathable insulated jacket for high output activities in cold conditions. The air permeable materials used mean swift transfer of body heat and moisture build up, regulating body temperature, to keep you from overheating. These properties also mean the Proton works outstandingly well as a mid-layer beneath a shell.Not available for shipping outside of the UK and EU. (Excluding DE) Arc'teryx Proton LT Men's Hoodie - Microchip