Look forward to your fastest bike leg yet in Castelli's Stealth T1 Top! This lightweight jersey features a second-skin fit to improve your aerodynamics on the bike. With a Velocity Fabric front and Velocity Mesh back and shoulders, as well as UPF 16 protection, you'll stay cool and comfortable while you're digging deep. A half-length zipper gives you even more options for regulating your temperature, and an elastic waist with silicone grippers keeps the hem in place when you're reaching for the aero bars.