Trail running, jogging or mountain biking on the agenda? The Mens Flyweight Trail Jacket from Jack Wolfskin is designed specifically for fast-paced outdoor sports. The Flex Shield Airlite fabric is exceptionally breathable, light and stretchy. It regulates your body temperature and flexes as you move. Mesh inserts on the back and under the arms provide extra ventilation. This featherweight softshell jacket is great to wear for outdoor training sessions. When the weather is constantly changing between sun, wind and showers, it will keep you dry and agile. It also packs down to nothing so it will fit in your waist pack and for those twilight training sessions, the all-round reflective detailing ensures you stay visible.