If you're lucky enough to live in a place that only experiences mild winters, this is your jacet. The Mortirolo is a jacket comprised of two parts. The front uses Castelli's Windstopper X-Fast 2 fabric to provide water resistance and wind protection. Cyclists living in low wind climates don't require max windproof coverage so the back of the Mortirolo is made from a warmer, moisture-wicking fabric to keep you warm and dry. This combination of materials protects your body from the elements, yet keeps you from overheating. Two vertical zippers on the front of the jacket add to the breathability. Rear reflective tabs improve visibility on dark days.