Castelli Women's DO.DI.CI. Cycling Jacket With cutting-edge Ristretto technology offering twelve times the air permeability of previous Castelli all-weather jackets (DO.DI.CI. is Italian for twelve), the Castelli Women's DO.DI.CI Jacket keeps you perfectly dry and body temperature perfectly regulated. For cyclists pushing the pace, the DO.DI.CI. blurs the line between jersey and jacket. Castelli’s engineered air permeability lets just the right amount of air pass through -; enough to evaporate sweat efficiently without letting the cold bite. The result is consistent, reliable comfort across cool to mild rides. Add in the close-to-body race fit, ultra-stretch fabrics and minimalist construction, and you’ve got a jacket built for pure performance without compromise. Every detail is tuned for real-world riding: a smooth-sliding YKK® Vislon® zip, three practical rear pockets, and reflective piping for essential low-light visibility. Castelli’s collaboration with fabric experts ITTTAI® brings advanced membrane and lamination technology that boosts breathability, stretch and water protection. If you want a dry-weather jacket that elevates every fast ride, the Castelli Women's DO.DI.CI. is simply in a league of its own.