Castelli Perfetto Light Jersey Polyester Gore Windstopper 150 is an extremely lightweight, soft, 4-way stretch polyester/elastane fabric that provides breathable, windproof and water-repellent performance Nano Light fabric on back sheds water but allows significant breathability Full-length YKK Vislon zipper maximizes ventilation Silicone gripper hem keeps jersey in position Drop tail hem for extra coverage