2XU Apparel Size Chart The Wind Defense Cycle Jacket is made with 2X 20K STRETCH membrane fabric to provide extreme moisture management and waterproofing. This stretch fabric provides a precise fit for comfort and aerodynamics. It has an anatomical fit designed specifically for the cycle position. Features: - PU membrane for 20K moisture management coupled with 20K waterproofing - Stretch fabric - Anatomical cycle fit - Reflective trims for visibility - Rear pockets for storage