The Assos Series SL Sleeveless jersey is designed to keep you cool no matter how blazing hot it is. Wear as the 1st layer against your skin, no base layer beneath. In fact, you can even use it as a base layer in cooler conditions. It's built with lightweight microfiber inserts on the shoulders and pockets and a lower back elastic net. Full zip, three pockets. The arm holes are nicely lined, too, so you won't feel any chafing. Available in numerous colors, in sizes Small-TIR.