Castelli Size Chart Castelli designed this jacket for moderate-intensity riding in cool conditions or for high-intensity riding in cold conditions. It has fleece-lined Gore(R) Windstopper(R) X-Fast fabric on the front and the sleeves to keep the cold out, while Warmer fabric on the back panel lets heat escape and ensures air exchange to keep you drier. The lightweight, close-to-body construction makes it feel closer to a long-sleeve jersey than to the traditional cycling jacket. Features: - Gore(R) Windstopper(R) X-Fast fabric on front is windproof and water-resistant - Warmer fleece fabric on back for additional breathability - Silicone gripper at waist keeps jacket from riding up - Anatomic form-fit cut for cycling position - Full-length YKK(R) Vislon(R) zipper with neck protector - Flip-up Thermoflex collar - Side panels in Thermoflex for extra breathability - 3 external rear pockets - Rear reflective tabs keep you visible in low-light conditions - Weight: 401g