Jack Wolfskin Men’s Zenon XT Insulated Jacket. Developed for challenging alpine adventures, the Jack Wolfskin Men’s Zenon XT is an insulated hybrid jacket which blends the unbeatable warmth-to-weight ratio of down with the water-repellent advantages of synthetic loose fibrefill insulation. These two different fillings work together to achieve optimum insulation and are used within this lightweight and windproof jacket to ensure that you remain warm as you explore. So buy this Jack Wolfskin Men’s Zenon XT Insulated Jacket Was £150.00 Now £125.00.