Castelli Alpha ROS 2 Womens Jacket Castelli's Alpha ROS 2 Women's Jacket provides the ultimate winter protection by utilising a blend of technical fabrics and a construction that help to keep the elements out. Gore-Tex Infinium Windstopper 150 is windproof and water-resistant, and together with the minimal seams, sealed at the shoulders, creates the best possible barrier against the rain and wind. An inner insulating layer helps to retain body heat and keep you warm when the temperature is down to single digits and even below zero. Despite the protection, breathability isn't compromised thanks to the Alpha double-layered design. Stretch in the material ensures a close yet unrestrictive fit and the waist has a raw edge hem so the jacket sits smoothly against the body and won't shift while you ride, whether the pockets are empty or packed full. Four pockets take care of storage, with the front one zipped to secure valuables and there's a full-length zip for adjusting to changing conditions.