Before Castelli was known as Castelli, the company was called Vittore Gianni and with it came more than a century of knowledge in wool clothing. Wool isn't perfect for every occasion, but for special applications it's hard to beat. The Unavolta comes with a 74/26 polyester/wool mix, with the polyester being inside to help wick moisture away. You'll stay warm and dry with this very lightweight jersey. Very easy to care for, and very cool retro styling.