The Mens Jasper Flex Jacket from Jack Wolfskin is for perfect for everything from extended treks to short hikes, high peaks or dense forests. With a smooth, waterproof outer layer and equipped with flex inserts, it's so comfortable you'll want to wear it all day. When you're pushing hard uphill, you can open up the pit zips for a cooling flow of fresh air. In fine weather, you can detach the hood and stash it one of the many pockets and in the winter, the system zip allows you to combine it with a compatible fleece jacket. Teaming two jackets in this way creates a winter-ready combination of weather protection and insulation.