Castelli Cycling Jersey Castelli Women's Aero Race FZ Short Sleeve Cycling Jersey. The fastest Cycling Jersey Castelli has ever made, the Women's Aero Race FZ is the biggest leap forward in terms of race performance. New Velocity Dry fabric with Aero technology is highly breathable, quick drying and saves 22 watts at 25mph that's about 88 seconds gained per hour! It's also extremely light, coming in at just 98g. That's about 45g lighter than a standard Cycling Jersey and almost the same weight as the Climber's Cycling Jersey, yet it's significantly more aerodynamic. Mesh back panel features a 3D structure that lifts the fabric off the skin for improved wicking and reduced cling. Full YKK zip provides great ventilation and easy onoff while the Air Mesh arm bands keep you cool and streamlined. Silicone gripper hem stays put when you're down in the drops and there's a compression band around the back pockets to prevent them from moving or bouncing when they're loaded up. The Women's Aero Race FZ is your go to piece for aerodynamics and fast drying comfort.