The Jack Wolfskin Mens JWP Windproof Down Jacket in this Black colourway. If light and warm is what you’re after, the JWP DOWN is the jacket for you. This down jacket is part of our PACK AND GO! series. It has a very small packed size and weighs next to nothing, so it’s ideal for active travel and spur-of-the-moment adventures. The jacket has a high performance RDS-certified duck down fill. A windproof STORMLOCK shell provides double protection: it shuts out the wind and shrugs off light showers