Lightweight jacket with good insulation for hiking trips. The Men's Zenon Altis Jacket reduces your load and increases your warmth. This hybrid down jacket is predominantly filled with high-loft duck down. But in areas where pack straps exert pressure, the sleeves and shoulders, Jack Wolfskin have used Jack Wolfskin's robust Fibercloud synthetic fibre fill. The windproof outer fabric further enhances the insulation performance.And if the weather turns mean, simply use the System Zip to combine the Men's Zenon Altis Jacket with a compatible weatherproof shell jacket and forget about the rain, snow and cold.The jacket's lightweight fill materials and thin fabrics mean it packs down small and takes up very little space in your backpack. When not needed, simply stash it in its own hip pocket, ready for action.