The Castelli Fondo 2 Jersey FZ is a core layering jersey that can be worn on its own or under a vest on cooler morning training rides. Made with polyester fleece, a warmer fabric that is thickly brushed on the inside for a soft warmth. The 100% polyester composition wicks sweat so you stay dry. When you need more ventilation, it’ll be easy to open the YKK Vislon zipper. You’ll look great in the solid-colored jersey and have some visibility with bands on the sleeves and a vertical stripe on the pocket.