The Montane Icarus Insulated Men's Jacket is super lightweight and completely packable. PrimaLoft® ThermoPlume Technology is a new synthetic fill which comes the closest yet to mimicking the structure of down to provide an incredibly lightweight and warm insulation. The outer the Icarus Pertex Quantum Eco® fabric is windproof and water resistant too meaning you will be protected from the cold chill and that odd shower here and there. The hems and the cuffs are adjustable to size which helps to prevent heat loss. The insulated hood is perfect for use under a climbing helmet.