Designed to keep the wind off your chest, the Castelli ProSecco Wind Long Sleeve Baselayer fits under your favorite jersey for comfort in cool conditions or during high-intensity cold weather rides. Gore Windstopper front panel is windproof, water-repellent and breathable. ProSecco fabric with hydrophilic treatment provides excellent moisture management and allows for quick evaporation. Mid-height collar offers protection and flatlock stitching at hem tucks into a jersey or shirt without chafing.