Castelli Mortirolo Due Jacket. A windproof jacket for cycling in mild winter conditions. The Mortirolo Due Jacket features a WINDSTOPPER X-Fast front panel for breathable weatherproof protection and a Castelli Warmer Fabric back panel for moisture transfer and heat management. If you’re lucky enough to live in a place where winter isn’t all that cold, this the jacket for you. The Mortirolo is a jacket made in two parts. The front is constructed from Windstopper® X-Fast 2 fabric to provide total wind protection and water resistance. However, cyclists living in temperate climates don’t require full windproof coverage so the back of the Mortirolo is made from Warmer fabric to keep you warm while wicking moisture away to keep you dry. This combination of windproof and permeable materials protects your body from the wind, yet helps you avoid overheating. And buy this Castelli Mortirolo Due Jacket Was £175.00 Now £131.25.