The lightness of down and the robustness of synthetic fibres in one highly functional, super warm hybrid jacket–that's the Mens Zenon Storm Jacket from Jack Wolfskin. The high performance, RDS-certified duck down delivers excellent insulation performance, weighs hardly anything and has a pleasant, natural feel. For the areas that are subjected to pressure from backpack straps or most exposed to snow and rain, like the sleeves, shoulders and hood, it has an innovative synthetic fibre insulation. It is comparable to down in terms of performance, but is less sensitive to moisture, warm even when wet and fast wicking. The windproof fabric makes the jacket even warmer. It is very light and compressible and takes up very little space in your backpack. When you don't need it, just stuff it in the pack bag supplied and drop it in your pack. In the pouring rain, wear your hardshell over the top.