Like a down jacket - but without the down! The ROUTEBURN JACKET is made entirely of synthetic materials.The MICROGUARD SUPERLOFT synthetic fibre insulation feels like down and delivers very good warmth-to-weight performance. It also has good lofting capability, which makes the jacket very comfortable to wear. Even if it gets wet, it loses none of its insulation performance, and it dries out again quickly.The STORMLOCK outer fabric is breathable, light and windproof - ideal attributes for active outdoor sports. The jacket can be layered up or worn as a standalone. In wet weather you can wear it under your hardshell.